AUTOPLAY 

Navy Quartermaster Matthew Konchan of Johnstown, Pa., stands in a field of black-eyed Susans as he waits to participate in a wreath laying with Secretary of the Interior Sally Jewell during a memorial service at the Flight 93 National Memorial on Wednesday, Sept. 11, 2013 in Shanksville, Pa. (AP PhotoGene J. Puskar)
Navy Quartermaster Matthew Konchan of Johnstown, Pa., stands in a field of black-eyed Susans as he waits to participate in a wreath laying with Secretary of the Interior Sally Jewell during a memorial service at the Flight 93 National Memorial on Wednesday, Sept. 11, 2013 in Shanksville, Pa. (AP Photo/Gene J. Puskar)
Yachiyo Kuge of Osaka, Japan, touches the Wall of Names where her son Toshiya Kuges name is located at the Flight 93 National Memorial near Shanksville, Pa., Wednesday, Sept. 11, 2103. Kuges son died on board Flight 93 at age 20. The memorial contains the names of the 40 crew and passengers on Flight 93. (AP PhotoTribune-Democrat, John Rucosky)
Yachiyo Kuge of Osaka, Japan, touches the Wall of Names where her son Toshiya Kuge's name is located at the Flight 93 National Memorial near Shanksville, Pa., Wednesday, Sept. 11, 2103. Kuge's son died on board Flight 93 at age 20. The memorial contains the names of the 40 crew and passengers on Flight 93. (AP Photo/Tribune-Democrat, John Rucosky)
The family and friends of the passengers and crew of Flight 93 gather around a boulder that marks the planes impact area during a memorial service at the Flight 93 National Memorial on Wednesday, Sept. 11, 2013, in Shanksville, Pa. Wednesday marks the 12th anniversary of the 911 terrorist attacks. (AP PhotoGene J. Puskar)
The family and friends of the passengers and crew of Flight 93 gather around a boulder that marks the plane's impact area during a memorial service at the Flight 93 National Memorial on Wednesday, Sept. 11, 2013, in Shanksville, Pa. Wednesday marks the 12th anniversary of the 9/11 terrorist attacks. (AP Photo/Gene J. Puskar)
Secretary of the Interior Sally Jewell, left, and Gordon Felt, center, brother of Edward P. Felt, a passenger on Flight 93, place a wreath with the help of Navy honor guard Matthew Konchan, of Johnstown, Pa., in front of the wall containing the names of the 40 crew and passengers on Flight 93 at the Flight 93 National Memorial on Wednesday, Sept. 11, 2013 in Shanksville, Pa.. The boulder, top in the distance, marks the area of the planes impact. Wednesday marked the 12th anniversary of the 911 terrorist attacks. (AP PhotoGene J. Puskar)
Secretary of the Interior Sally Jewell, left, and Gordon Felt, center, brother of Edward P. Felt, a passenger on Flight 93, place a wreath with the help of Navy honor guard Matthew Konchan, of Johnstown, Pa., in front of the wall containing the names of the 40 crew and passengers on Flight 93 at the Flight 93 National Memorial on Wednesday, Sept. 11, 2013 in Shanksville, Pa.. The boulder, top in the distance, marks the area of the plane's impact. Wednesday marked the 12th anniversary of the 9/11 terrorist attacks. (AP Photo/Gene J. Puskar)
A visitor walks through the Empty Sky memorial to New Jerseys victims of the Sept. 11, 2001 terrorist attacks on Wednesday, Sept. 11, 2013, in Jersey City, N.J. One World Trade Center is visible across the Hudson River. Ceremonies will be held Wednesday to mark the 12th anniversary of the attacks. (AP PhotoMel Evans)
A visitor walks through the "Empty Sky" memorial to New Jersey's victims of the Sept. 11, 2001 terrorist attacks on Wednesday, Sept. 11, 2013, in Jersey City, N.J. One World Trade Center is visible across the Hudson River. Ceremonies will be held Wednesday to mark the 12th anniversary of the attacks. (AP Photo/Mel Evans)
Red roses are placed next to names of victims of the Sept. 11, 2001 terrorist attacks on the U.S. at a memorial site during a ceremony marking the 12th anniversary of 911 outside Jerusalem, Wednesday, Sept. 11, 2013. (AP PhotoBernat Armangue)
Red roses are placed next to names of victims of the Sept. 11, 2001 terrorist attacks on the U.S. at a memorial site during a ceremony marking the 12th anniversary of 9/11 outside Jerusalem, Wednesday, Sept. 11, 2013. (AP Photo/Bernat Armangue)
Geraldine Davie of Pelham, N.Y., cries after viewing name of her 23-year-old daughter, Amy ODoherty, on the wall at the Sept. 11 memorial during the 12th anniversary observance of the 911 terrorist attacks on the World Trade Center. ODoherty was killed in the Sept. 11, 2001 attack. (AP PhotoDavid Handschuh, Pool)
Geraldine Davie of Pelham, N.Y., cries after viewing name of her 23-year-old daughter, Amy O'Doherty, on the wall at the Sept. 11 memorial during the 12th anniversary observance of the 9/11 terrorist attacks on the World Trade Center. O'Doherty was killed in the Sept. 11, 2001 attack. (AP Photo/David Handschuh, Pool)
Members of the Naval Air Station Joint Reserve Base in nearby Fort Worth, stand as they form the color guard during the national anthem before a baseball game between the Texas Rangers and the Pittsburgh Pirates, Wednesday, September 11, 2013, at the Rangers Ballpark in Arlington, Texas. (Special to the Star-TelegramJim Cowsert)
Members of the Naval Air Station Joint Reserve Base in nearby Fort Worth, stand as they form the color guard during the national anthem before a baseball game between the Texas Rangers and the Pittsburgh Pirates, Wednesday, September 11, 2013, at the Rangers Ballpark in Arlington, Texas. (Special to the Star-Telegram/Jim Cowsert)
Memphis Fire Department recruit Justin Davis unfurls his flag as the recruits prepare to follow the MFD and MPD color guard in Memphis, Tenn. Wednesday, Sept. 11, 2013, to start the memorial service at the Memphis Fire Museum for the victims of the September 11 terrorist attack. (AP PhotoThe Commercial Appeal, Mike Brown)
Memphis Fire Department recruit Justin Davis unfurls his flag as the recruits prepare to follow the MFD and MPD color guard in Memphis, Tenn. Wednesday, Sept. 11, 2013, to start the memorial service at the Memphis Fire Museum for the victims of the September 11 terrorist attack. (AP Photo/The Commercial Appeal, Mike Brown)
Nevaeh Lewis, left, and Jonathan Wilson move through the September 11 Memorial in Indianapolis, Wednesday, Sept. 11, 2013 where a bouquet of flowers was placed to honor the victims of the 911 attacks on the 12th anniversary at the base of one of two beams taken from the World Trade Center. (AP PhotoMichael Conroy)
Nevaeh Lewis, left, and Jonathan Wilson move through the September 11 Memorial in Indianapolis, Wednesday, Sept. 11, 2013 where a bouquet of flowers was placed to honor the victims of the 9/11 attacks on the 12th anniversary at the base of one of two beams taken from the World Trade Center. (AP Photo/Michael Conroy)
A woman pauses along the edge of the north reflecting pool at the 911 Memorial during a ceremony marking the 12th anniversary of the 911 attacks on the World Trade Center in New York, September 11, 2013. (AP PhotoJustin Lane, Pool)
A woman pauses along the edge of the north reflecting pool at the 9/11 Memorial during a ceremony marking the 12th anniversary of the 9/11 attacks on the World Trade Center in New York, September 11, 2013. (AP Photo/Justin Lane, Pool)
A pair of people embrace as friends and relatives of the victims of the 911 terrorist attacks gather at the National September 11 Memorial at the World Trade Center site, Wednesday, Sept. 11, 2013, for a ceremony marking the 12th anniversary of the attacks in New York. (AP PhotoJason DeCrow)
A pair of people embrace as friends and relatives of the victims of the 9/11 terrorist attacks gather at the National September 11 Memorial at the World Trade Center site, Wednesday, Sept. 11, 2013, for a ceremony marking the 12th anniversary of the attacks in New York. (AP Photo/Jason DeCrow)
A woman wipes her eyes after reading the name of her brother, Bobby Hughes, as friends and relatives of the victims of the 911 terrorist attacks gather at the National September 11 Memorial at the World Trade Center site, Wednesday, Sept. 11, 2013, for a ceremony marking the 12th anniversary of the attacks in New York. (AP PhotoJason DeCrow)
A woman wipes her eyes after reading the name of her brother, Bobby Hughes, as friends and relatives of the victims of the 9/11 terrorist attacks gather at the National September 11 Memorial at the World Trade Center site, Wednesday, Sept. 11, 2013, for a ceremony marking the 12th anniversary of the attacks in New York. (AP Photo/Jason DeCrow)
A passenger waves in support of walkers during the 21-mile March to the Arch memorial walk on Wednesday, Sept. 11, 2013, in Chesterfield, Mo. Wednesday marked the 12th anniversary of the 911 terrorist attacks.. (AP PhotoSt. Louis Post-Dispatch, Erik M. Lunsford)
A passenger waves in support of walkers during the 21-mile "March to the Arch" memorial walk on Wednesday, Sept. 11, 2013, in Chesterfield, Mo. Wednesday marked the 12th anniversary of the 9/11 terrorist attacks.. (AP Photo/St. Louis Post-Dispatch, Erik M. Lunsford)
Crystal Eubanks, a JROTC student at Beaumont High School, stands up flags outside the school on Wednesday, Sept. 11, 2013, in St. Louis. On Tuesday night, ROTC students put up about 3,000 flags as tribute to the people who lost their lives in the attacks of Sept. 11, 2001. Wednesday marked the 12th anniversary of the 911 terrorist attacks. (AP PhotoSt. Louis Post-Dispatch, David Carson)
Crystal Eubanks, a JROTC student at Beaumont High School, stands up flags outside the school on Wednesday, Sept. 11, 2013, in St. Louis. On Tuesday night, ROTC students put up about 3,000 flags as tribute to the people who lost their lives in the attacks of Sept. 11, 2001. Wednesday marked the 12th anniversary of the 9/11 terrorist attacks. (AP Photo/St. Louis Post-Dispatch, David Carson)
With flags flying, bikers head down 3rd Street through the National Mall. (WTOPAndrew Mollenbeck)
With flags flying, bikers head down 3rd Street through the National Mall. (WTOP/Andrew Mollenbeck)
(WTOPDick Uliano)
(WTOP/Dick Uliano)
Park Police motorcycles line the space between a Muslim rally and Christian counter demonstrators. (WTOPAndrew Mollenbeck)
Park Police motorcycles line the space between a Muslim rally and Christian counter demonstrators. (WTOP/Andrew Mollenbeck)
The World Trade Center Flag is presented as friends and relatives of the victims of the 911 terrorist attacks gather at the National September 11 Memorial at the World Trade Center site, Wednesday, Sept. 11, 2013, for a ceremony marking the 12th anniversary of the attacks in New York. (AP PhotoJason DeCrow)
The World Trade Center Flag is presented as friends and relatives of the victims of the 9/11 terrorist attacks gather at the National September 11 Memorial at the World Trade Center site, Wednesday, Sept. 11, 2013, for a ceremony marking the 12th anniversary of the attacks in New York. (AP Photo/Jason DeCrow)
Friends and family members gather at the 911 Memorial during ceremonies marking the 12th anniversary of the 911 attacks on the World Trade Center in New York, Sept. 11, 2013. (AP PhotoAlejandra Villa, Pool)
Friends and family members gather at the 9/11 Memorial during ceremonies marking the 12th anniversary of the 9/11 attacks on the World Trade Center in New York, Sept. 11, 2013. (AP Photo/Alejandra Villa, Pool)
Hector Garcia of Brooklyn, N.Y., accompanied by his daughter Tania, carries photo of his daughter Marilyn, Tanias sister, who died in the attacks on the World Trade Center, as they arrive for ceremonies marking the 12th anniversary of the 911 attacks, in New York, Wednesday Sept. 11, 2013 (AP PhotoThe Record, Chris Pedota, Pool)
Hector Garcia of Brooklyn, N.Y., accompanied by his daughter Tania, carries photo of his daughter Marilyn, Tania's sister, who died in the attacks on the World Trade Center, as they arrive for ceremonies marking the 12th anniversary of the 9/11 attacks, in New York, Wednesday Sept. 11, 2013 (AP Photo/The Record, Chris Pedota, Pool)
Four World Trade Center, center, stands next to One World Trade Center, left, in lower Manhattan, Wednesday, Sept. 11, 2013 in New York. Ceremonies will be held Wednesday at the memorial to mark the 12th anniversary of the 2001 terrorist attacks. (AP PhotoMark Lennihan)
Four World Trade Center, center, stands next to One World Trade Center, left, in lower Manhattan, Wednesday, Sept. 11, 2013 in New York. Ceremonies will be held Wednesday at the memorial to mark the 12th anniversary of the 2001 terrorist attacks. (AP Photo/Mark Lennihan)
The National September 11 Memorial and Museum, top, stands next to the vehicle security building, below, Wednesday, Sept. 11, 2013 in New York. Ceremonies will be held Wednesday at the memorial to mark the 12th anniversary of the 2001 terrorist attacks. (AP PhotoMark Lennihan)
The National September 11 Memorial and Museum, top, stands next to the vehicle security building, below, Wednesday, Sept. 11, 2013 in New York. Ceremonies will be held Wednesday at the memorial to mark the 12th anniversary of the 2001 terrorist attacks. (AP Photo/Mark Lennihan)
The National September 11 Memorial and Museum is ringed by skyscrapers, Wednesday, Sept. 11, 2013 in New York. Ceremonies will be held Wednesday at the memorial to mark the 12th anniversary of the 2001 terrorist attacks. (AP PhotoMark Lennihan)
The National September 11 Memorial and Museum is ringed by skyscrapers, Wednesday, Sept. 11, 2013 in New York. Ceremonies will be held Wednesday at the memorial to mark the 12th anniversary of the 2001 terrorist attacks. (AP Photo/Mark Lennihan)
One World Trade Center rises above the National September 11 Memorial and Museum, Wednesday, Sept. 11, 2013, in New York. Ceremonies will be held Wednesday at the memorial to mark the 12th anniversary of the 2001 terrorist attacks. (AP PhotoMark Lennihan)
One World Trade Center rises above the National September 11 Memorial and Museum, Wednesday, Sept. 11, 2013, in New York. Ceremonies will be held Wednesday at the memorial to mark the 12th anniversary of the 2001 terrorist attacks. (AP Photo/Mark Lennihan)
A firefighter pauses for a quiet moment as friends and relatives of the victims of 911 gather for a ceremony marking the 12th anniversary of the attacks at the National September 11 Memorial at the World Trade Center site, Wednesday, Sept. 11, 2013, in New York. (AP PhotoJason DeCrow)
A firefighter pauses for a quiet moment as friends and relatives of the victims of 9/11 gather for a ceremony marking the 12th anniversary of the attacks at the National September 11 Memorial at the World Trade Center site, Wednesday, Sept. 11, 2013, in New York. (AP Photo/Jason DeCrow)
Visitors to the Flight 93 National Memorial participate in a sunset ceremony with a giant flag memorializing Flight 93 on Tuesday, Sept. 10, 2013. Wednesday will be the 12th anniversary of the crash of United Flight 93 in this western Pennsylvania field. (AP PhotoGene J. Puskar)
Visitors to the Flight 93 National Memorial participate in a sunset ceremony with a giant flag memorializing Flight 93 on Tuesday, Sept. 10, 2013. Wednesday will be the 12th anniversary of the crash of United Flight 93 in this western Pennsylvania field. (AP Photo/Gene J. Puskar)
President Barack Obama, first lady Michelle Obama, Vice President Joe Biden, and Jill Biden stand for a moment of silence on the South Lawn at the White House in Washington, Wednesday, Sept. 11, 2013, as they mark the 12th anniversary of the September 11 terror attacks. (AP PhotoCharles Dharapak)
President Barack Obama, first lady Michelle Obama, Vice President Joe Biden, and Jill Biden stand for a moment of silence on the South Lawn at the White House in Washington, Wednesday, Sept. 11, 2013, as they mark the 12th anniversary of the September 11 terror attacks. (AP Photo/Charles Dharapak)
President Barack Obama, first lady Michelle Obama, Vice President Joe Biden and Jill Biden join members of the White House staff during a moment of silence to mark the 12th anniversary of the 911 attacks, Wednesday, Sept. 11, 2013, on the South Lawn of the White House in Washington. (AP PhotoPablo Martinez Monsivais)
President Barack Obama, first lady Michelle Obama, Vice President Joe Biden and Jill Biden join members of the White House staff during a moment of silence to mark the 12th anniversary of the 9/11 attacks, Wednesday, Sept. 11, 2013, on the South Lawn of the White House in Washington. (AP Photo/Pablo Martinez Monsivais)
Surrounded by White House staff members, President Barack Obama, first lady Michelle Obama, Vice President Joe Biden, and Jill Biden arrive for a moment of silence on the South Lawn of the White House in Washington, Wednesday, Sept. 11, 2013, marking the 12th anniversary of the September 11 terror attacks. (AP PhotoCharles Dharapak)
Surrounded by White House staff members, President Barack Obama, first lady Michelle Obama, Vice President Joe Biden, and Jill Biden arrive for a moment of silence on the South Lawn of the White House in Washington, Wednesday, Sept. 11, 2013, marking the 12th anniversary of the September 11 terror attacks. (AP Photo/Charles Dharapak)
President Barack Obama, first lady Michelle Obama, Vice President Joe Biden, and Jill Biden arrive for a moment of silence on the South Lawn at the White House in Washington, Wednesday, Sept. 11, 2013, to mark the 12th anniversary of the September 11 terror attacks. (AP PhotoPablo Martinez Monsivais)
President Barack Obama, first lady Michelle Obama, Vice President Joe Biden, and Jill Biden arrive for a moment of silence on the South Lawn at the White House in Washington, Wednesday, Sept. 11, 2013, to mark the 12th anniversary of the September 11 terror attacks. (AP Photo/Pablo Martinez Monsivais)
President Barack Obama, first lady Michelle Obama, Vice President Joe Biden and Jill Biden join members of the White House staff during a moment of silence to mark the 12th anniversary of the 911 attacks, Wednesday, Sept. 11, 2013, on the South Lawn of the White House in Washington. (AP PhotoPablo Martinez Monsivais)
President Barack Obama, first lady Michelle Obama, Vice President Joe Biden and Jill Biden join members of the White House staff during a moment of silence to mark the 12th anniversary of the 9/11 attacks, Wednesday, Sept. 11, 2013, on the South Lawn of the White House in Washington. (AP Photo/Pablo Martinez Monsivais)
Bikers prepare to ride into D.C. to honor the victims of Sept. 11. (WTOPDick Uliano)
Bikers prepare to ride into D.C. to honor the victims of Sept. 11. (WTOP/Dick Uliano)
Following a ceremony, firefighters and first responders with the FDNY Motorcycle Club and other attendees make their way towards the 911 Memorial on Wednesday, Sept. 11, 2013, after a ride from FDNY Rescue 1 headquarters to the World Trade Center site for the 12th anniversary of the 2001 terrorist attacks. The ride represented the firefighters who responded to the attacks on that day. (AP PhotoCraig Ruttle)
Following a ceremony, firefighters and first responders with the FDNY Motorcycle Club and other attendees make their way towards the 9/11 Memorial on Wednesday, Sept. 11, 2013, after a ride from FDNY Rescue 1 headquarters to the World Trade Center site for the 12th anniversary of the 2001 terrorist attacks. The ride represented the firefighters who responded to the attacks on that day. (AP Photo/Craig Ruttle)
A woman walks along the edge of the North Pool at the 911 Memorial during a ceremony marking the 12th anniversary of the 911 attacks on the World Trade Center, in New York, Wednesday, Sept. 11, 2013. (AP PhotoJustin Lane, Pool)
A woman walks along the edge of the North Pool at the 9/11 Memorial during a ceremony marking the 12th anniversary of the 9/11 attacks on the World Trade Center, in New York, Wednesday, Sept. 11, 2013. (AP Photo/Justin Lane, Pool)
Relatives rub the names listed on the edge of a reflecting pool at the 911 Memorial during ceremonies marking the 12th anniversary of the attacks on the World Trade Center, in New York, Wednesday, Sept. 11, 2013. (AP PhotoNew York Daily News, David Handschuh, Pool)
Relatives rub the names listed on the edge of a reflecting pool at the 9/11 Memorial during ceremonies marking the 12th anniversary of the attacks on the World Trade Center, in New York, Wednesday, Sept. 11, 2013. (AP Photo/New York Daily News, David Handschuh, Pool)
Singer Billy Joel, left, takes off his helmet as he stands with New York Gov. Andrew Cuomo and motorcycle designer and television personality Paul Teutul, Jr. on Wednesday, Sept. 11, 2013, after they rode with firefighters and first responders with the FDNY Motorcycle Club to the World Trade Center site for the 12th anniversary of the Sept. 11 terrorist attacks. The ride represented the firefighters who responded to the attacks on that day. (AP PhotoCraig Ruttle)
Singer Billy Joel, left, takes off his helmet as he stands with New York Gov. Andrew Cuomo and motorcycle designer and television personality Paul Teutul, Jr. on Wednesday, Sept. 11, 2013, after they rode with firefighters and first responders with the FDNY Motorcycle Club to the World Trade Center site for the 12th anniversary of the Sept. 11 terrorist attacks. The ride represented the firefighters who responded to the attacks on that day. (AP Photo/Craig Ruttle)
Ron Joy makes a rubbing of his friends name, New York Fire Department firefighter Capt. Vincent Giammona, at the South reflecting pool at the 911 Memorial on Wednesday, Sept. 11, 2013, during ceremonies marking the 12th anniversary of the Sept. 11 terrorist attacks in New York. (AP PhotoStan Honda, Pool)
Ron Joy makes a rubbing of his friend's name, New York Fire Department firefighter Capt. Vincent Giammona, at the South reflecting pool at the 9/11 Memorial on Wednesday, Sept. 11, 2013, during ceremonies marking the 12th anniversary of the Sept. 11 terrorist attacks in New York. (AP Photo/Stan Honda, Pool)
A group called 2 Million Bikers to D.C. prepares to ride into D.C. to honor the victims of Sept. 11. (WTOPDick Uliano)
A group called 2 Million Bikers to D.C. prepares to ride into D.C. to honor the victims of Sept. 11. (WTOP/Dick Uliano)
One of the bikers with a group called 2 Million Bikers to D.C. that is riding into the District on Sept. 11. (WTOPDick Uliano)
One of the bikers with a group called 2 Million Bikers to D.C. that is riding into the District on Sept. 11. (WTOP/Dick Uliano)
Bikers with a group called 2 Million Bikers to D.C. prepare to ride into the District on Sept. 11 to mark the 12th anniversary of the terror attacks. (WTOPDick Uliano)
Bikers with a group called 2 Million Bikers to D.C. prepare to ride into the District on Sept. 11 to mark the 12th anniversary of the terror attacks. (WTOP/Dick Uliano)
Members of 2 Million Bikers to D.C. get ready to ride into the District on Sept. 11. The group requested police escorts and no-stop permits, but was denied by the National Park Service and the Metropolitan Police Department. (WTOPDick Uliano)
Members of 2 Million Bikers to D.C. get ready to ride into the District on Sept. 11. The group requested police escorts and no-stop permits, but was denied by the National Park Service and the Metropolitan Police Department. (WTOP/Dick Uliano)
TSA agents sing God Bless America at a checkpoint in Cleveland Hopkins International Airport on Wednesday, Sept. 11, 2013, during a ceremony marking the 12th anniversary of the 2001 terrorist attacks. (AP PhotoMark Duncan)
TSA agents sing" God Bless America" at a checkpoint in Cleveland Hopkins International Airport on Wednesday, Sept. 11, 2013, during a ceremony marking the 12th anniversary of the 2001 terrorist attacks. (AP Photo/Mark Duncan)
Retired FDNY Marshal, Ernie Medaglia, of Bronxville, N.Y., who was at the attacks at the World Trade Center on Sept. 11, 2001, is emotional as he listens to New York Gov. Andrew Cuomo at a ceremony near the 911 Memorial honoring first responders and FDNY Rescue 1 on the 12th anniversary of the attacks on the World Trade Center in New York Wednesday, Sept. 11, 2013. (AP PhotoCraig Ruttle)
Retired FDNY Marshal, Ernie Medaglia, of Bronxville, N.Y., who was at the attacks at the World Trade Center on Sept. 11, 2001, is emotional as he listens to New York Gov. Andrew Cuomo at a ceremony near the 9/11 Memorial honoring first responders and FDNY Rescue 1 on the 12th anniversary of the attacks on the World Trade Center in New York Wednesday, Sept. 11, 2013. (AP Photo/Craig Ruttle)
A TSA color guard takes part in a ceremony at Cleveland Hopkins Airport Wednesday, Sept. 11, 2013, marking the 12th anniversary of the 911 terror attacks. (AP PhotoMark Duncan)
A TSA color guard takes part in a ceremony at Cleveland Hopkins Airport Wednesday, Sept. 11, 2013, marking the 12th anniversary of the 9/11 terror attacks. (AP Photo/Mark Duncan)
Singer Billy Joel, left, and motorcycle designer and television personality Paul Teutul, Jr., look up at One World Trade Center Wednesday, Sept. 11, 2013, after they rode with firefighters and first responders with the FDNY Motorcycle Club from FDNY Rescue 1 headquarters to the World Trade Center site for the 12th anniversary commemorations of the 911 attacks. The ride represented the firefighters who responded on 911. (AP PhotoCraig Ruttle)
Singer Billy Joel, left, and motorcycle designer and television personality Paul Teutul, Jr., look up at One World Trade Center Wednesday, Sept. 11, 2013, after they rode with firefighters and first responders with the FDNY Motorcycle Club from FDNY Rescue 1 headquarters to the World Trade Center site for the 12th anniversary commemorations of the 9/11 attacks. The ride represented the firefighters who responded on 9/11. (AP Photo/Craig Ruttle)
Retired FDNY Marshal Ernie Medaglia, of Bronxville, N.Y., who was at the attacks at the World Trade Center on Sept. 11, 2001, is emotional as he listens to New York Gov. Andrew Cuomo at a ceremony near the 911 Memorial honoring first responders and FDNY Rescue 1 on the 12th anniversary of the attacks on the World Trade Center in New York Wednesday, Sept. 11, 2013. (AP PhotoCraig Ruttle)
Retired FDNY Marshal Ernie Medaglia, of Bronxville, N.Y., who was at the attacks at the World Trade Center on Sept. 11, 2001, is emotional as he listens to New York Gov. Andrew Cuomo at a ceremony near the 9/11 Memorial honoring first responders and FDNY Rescue 1 on the 12th anniversary of the attacks on the World Trade Center in New York Wednesday, Sept. 11, 2013. (AP Photo/Craig Ruttle)
Two people stand at the edge of the north reflecting pool at the 911 Memorial during a ceremony marking the 12th anniversary of the 911 attacks on the World Trade Center, in New York, Wednesday, Sept. 11, 2013. (AP PhotoJustin Lane, Pool)
Two people stand at the edge of the north reflecting pool at the 9/11 Memorial during a ceremony marking the 12th anniversary of the 9/11 attacks on the World Trade Center, in New York, Wednesday, Sept. 11, 2013. (AP Photo/Justin Lane, Pool)
Kayla Fallon, daughter of William Fallon who perished in Tower One when she was 8 years old, cries while visting the 911 Memorial during ceremonies marking the 12th anniversary of the 911 attacks on the World Trade Center in New York, Sept. 11, 2013. (AP PhotoJohn Angelillo, Pool)
Kayla Fallon, daughter of William Fallon who perished in Tower One when she was 8 years old, cries while visting the 9/11 Memorial during ceremonies marking the 12th anniversary of the 9/11 attacks on the World Trade Center in New York, Sept. 11, 2013. (AP Photo/John Angelillo, Pool)
Michelle Murray, of Rockaway, N.J., stands at the edge of the North Pool at the 911 Memorial during a ceremony marking the 12th anniversary of the 911 attacks on the World Trade Center in New York, Sept. 11, 2013. (AP PhotoJustin Lane, Pool)
Michelle Murray, of Rockaway, N.J., stands at the edge of the North Pool at the 9/11 Memorial during a ceremony marking the 12th anniversary of the 9/11 attacks on the World Trade Center in New York, Sept. 11, 2013. (AP Photo/Justin Lane, Pool)
Family members of Ji Yao Justin Zhao pay their respect at a ceremony marking the 12th anniversary of the 911 attacks on the World Trade Center in New York, Wednesday, Sept. 11, 2013. (AP PhotoMary Altaffer, Pool)
Family members of Ji Yao Justin Zhao pay their respect at a ceremony marking the 12th anniversary of the 9/11 attacks on the World Trade Center in New York, Wednesday, Sept. 11, 2013. (AP Photo/Mary Altaffer, Pool)
Jeana Fossali, a close family member of Police Officer John William Perry, traces his name engraved in the South Pool at the 911 Memorial during a ceremony marking the 12th anniversary of the 911 attacks on the World Trade Center in New York, Wednesday, Sept. 11, 2013. (AP PhotoMary Altaffer, Pool)
Jeana Fossali, a close family member of Police Officer John William Perry, traces his name engraved in the South Pool at the 9/11 Memorial during a ceremony marking the 12th anniversary of the 9/11 attacks on the World Trade Center in New York, Wednesday, Sept. 11, 2013. (AP Photo/Mary Altaffer, Pool)
A woman pauses at the south reflecting pool at the 911 Memorial during ceremonies marking the 12th anniversary of the 911 attacks on the World Trade Center in New York, Wednesday, Sept. 11, 2013. (AP PhotoStan Honda, Pool)
A woman pauses at the south reflecting pool at the 9/11 Memorial during ceremonies marking the 12th anniversary of the 9/11 attacks on the World Trade Center in New York, Wednesday, Sept. 11, 2013. (AP Photo/Stan Honda, Pool)
Friends and relatives of the victims of the 911 terrorist attacks gather at the National September 11 Memorial at the World Trade Center site, Wednesday, Sept. 11, 2013, for a ceremony marking the 12th anniversary of the attacks in New York. (AP PhotoJason DeCrow)
Friends and relatives of the victims of the 9/11 terrorist attacks gather at the National September 11 Memorial at the World Trade Center site, Wednesday, Sept. 11, 2013, for a ceremony marking the 12th anniversary of the attacks in New York. (AP Photo/Jason DeCrow)
President Barack Obama lays a wreath at the Pentagon, Wednesday, Sept. 11, 2013, during a ceremony marking the 12th anniversary of the worst terror attack on the US. The Pentagon was struck by one of the hijacked plane. (AP PhotoManuel Balce Ceneta)
President Barack Obama lays a wreath at the Pentagon, Wednesday, Sept. 11, 2013, during a ceremony marking the 12th anniversary of the worst terror attack on the US. The Pentagon was struck by one of the hijacked plane. (AP Photo/Manuel Balce Ceneta)
Friends and relatives of the victims of 911 terrorist attacks gather at the National September 11 Memorial at the World Trade Center site, Wednesday, Sept. 11, 2013, for a ceremony marking the 12th anniversary of the attacks in New York. (AP PhotoJason DeCrow)
Friends and relatives of the victims of 9/11 terrorist attacks gather at the National September 11 Memorial at the World Trade Center site, Wednesday, Sept. 11, 2013, for a ceremony marking the 12th anniversary of the attacks in New York. (AP Photo/Jason DeCrow)
The World Trade Center Flag is presented as friends and relatives of the victims of the 911 terrorist attacks gather at the National September 11 Memorial at the World Trade Center site, Wednesday, Sept. 11, 2013, for a ceremony marking the 12th anniversary of the attacks in New York. (AP PhotoJason DeCrow)
The World Trade Center Flag is presented as friends and relatives of the victims of the 9/11 terrorist attacks gather at the National September 11 Memorial at the World Trade Center site, Wednesday, Sept. 11, 2013, for a ceremony marking the 12th anniversary of the attacks in New York. (AP Photo/Jason DeCrow)
President Barack Obama lowers his head during a moment of silence at the Pentagon, Wednesday, Sept. 11, 2013, during a ceremony to mark the 12th anniversary of the 911 attacks. (AP PhotoPablo Martinez Monsivais)
President Barack Obama lowers his head during a moment of silence at the Pentagon, Wednesday, Sept. 11, 2013, during a ceremony to mark the 12th anniversary of the 9/11 attacks. (AP Photo/Pablo Martinez Monsivais)
A person pauses near a name on the wall of the Empty Sky memorial to New Jerseys victims of the 2001 terrorist attacks in Jersey City, N.J., Wednesday, Sept. 11, 2013. Ceremonies will be held Wednesday to mark the 12th anniversary of the attacks. (AP PhotoMel Evans)
A person pauses near a name on the wall of the "Empty Sky" memorial to New Jersey's victims of the 2001 terrorist attacks in Jersey City, N.J., Wednesday, Sept. 11, 2013. Ceremonies will be held Wednesday to mark the 12th anniversary of the attacks. (AP Photo/Mel Evans)
A person walks away after leaving a candle near a name at the wall of the Empty Sky the memorial to New Jerseys victims of the 2001 terrorist attacks Wednesday, Sept. 11, 2013, in Jersey City, N.J. Ceremonies will be held Wednesday to mark the 12th anniversary of the attacks. (AP PhotoMel Evans)
A person walks away after leaving a candle near a name at the wall of the "Empty Sky" the memorial to New Jersey's victims of the 2001 terrorist attacks Wednesday, Sept. 11, 2013, in Jersey City, N.J. Ceremonies will be held Wednesday to mark the 12th anniversary of the attacks. (AP Photo/Mel Evans)
Mija Quigley, of Princeton Junction, N.J., embraces the name of her son, Patrick Quigley, during ceremonies marking the 12th anniversary of the 911 attacks on the World Trade Center in New York, Wednesday, Sept. 11, 2013. Patrick Quigley died aboard Flight 175 when it crashed into the South Tower on 911. (AP PhotoChris Pedota, Pool)
Mija Quigley, of Princeton Junction, N.J., embraces the name of her son, Patrick Quigley, during ceremonies marking the 12th anniversary of the 9/11 attacks on the World Trade Center in New York, Wednesday, Sept. 11, 2013. Patrick Quigley died aboard Flight 175 when it crashed into the South Tower on 9/11. (AP Photo/Chris Pedota, Pool)
New Jersey Governor Chris Christie, left, and New York Governor Andrew Cuomo, right, attend ceremonies at the 911 Memorial marking the 12th Anniversary of the attacks on the World Trade Center, in New York, Wednesday, Sept. 11, 2013. (AP PhotoThe Daily News, David Handschuh, Pool)
New Jersey Governor Chris Christie, left, and New York Governor Andrew Cuomo, right, attend ceremonies at the 9/11 Memorial marking the 12th Anniversary of the attacks on the World Trade Center, in New York, Wednesday, Sept. 11, 2013. (AP Photo/The Daily News, David Handschuh, Pool)
From left, President Barack Obama, Defense Secretary Chuck Hagel and Joint Chiefs Chairman Gen. Martin Dempsey, pay their respects to the victims of the Sept 11 attacks during a remembrance ceremony at the Pentagon, Wednesday, Sept. 11, 2013. (AP PhotoManuel Balce Ceneta)
From left, President Barack Obama, Defense Secretary Chuck Hagel and Joint Chiefs Chairman Gen. Martin Dempsey, pay their respects to the victims of the Sept 11 attacks during a remembrance ceremony at the Pentagon, Wednesday, Sept. 11, 2013. (AP Photo/Manuel Balce Ceneta)
New York Mayor Michael Bloomberg, left, and Democratic mayoral hopeful Bill de Blasio attend the 911 Memorial ceremonies marking the 12th anniversary of the 911 attacks on the World Trade Center in New York, Wednesday, Sept. 11, 2013. (AP PhotoAdrees Latif, Pool)
New York Mayor Michael Bloomberg, left, and Democratic mayoral hopeful Bill de Blasio attend the 9/11 Memorial ceremonies marking the 12th anniversary of the 9/11 attacks on the World Trade Center in New York, Wednesday, Sept. 11, 2013. (AP Photo/Adrees Latif, Pool)
The sun rises in back of One World Trade Center in lower Manhattan, seen from Jersey City, N.J., Wednesday, Sept. 11, 2013. Ceremonies will be held Wednesday to mark the 12th anniversary of the 911 terrorist attacks. (AP PhotoMel Evans)
The sun rises in back of One World Trade Center in lower Manhattan, seen from Jersey City, N.J., Wednesday, Sept. 11, 2013. Ceremonies will be held Wednesday to mark the 12th anniversary of the 9/11 terrorist attacks. (AP Photo/Mel Evans)
From left, President Barack Obama, Defense Secretary Chuck Hagel and Joint Chiefs Gen. Martin Dempsey, pay their respects to the victims of the Sept 11 attacks during a remembrance ceremony at the Pentagon, Wednesday, Sept. 11, 2013. (AP PhotoManuel Balce Ceneta)
From left, President Barack Obama, Defense Secretary Chuck Hagel and Joint Chiefs Gen. Martin Dempsey, pay their respects to the victims of the Sept 11 attacks during a remembrance ceremony at the Pentagon, Wednesday, Sept. 11, 2013. (AP Photo/Manuel Balce Ceneta)
A girl wipes her face after reading the name of her father as friends and relatives of the victims of the 911 terrorist attacks gather at the National September 11 Memorial at the World Trade Center site, Wednesday, Sept. 11, 2013, for a ceremony marking the 12th anniversary of the attacks in New York. (AP PhotoJason DeCrow)
A girl wipes her face after reading the name of her father as friends and relatives of the victims of the 9/11 terrorist attacks gather at the National September 11 Memorial at the World Trade Center site, Wednesday, Sept. 11, 2013, for a ceremony marking the 12th anniversary of the attacks in New York. (AP Photo/Jason DeCrow)
Friends and relatives of the victims of the 911 terrorist attacks gather at the National September 11 Memorial at the World Trade Center site, Wednesday, Sept. 11, 2013, for a ceremony marking the 12th anniversary of the attacks in New York. (AP PhotoJason DeCrow)
Friends and relatives of the victims of the 9/11 terrorist attacks gather at the National September 11 Memorial at the World Trade Center site, Wednesday, Sept. 11, 2013, for a ceremony marking the 12th anniversary of the attacks in New York. (AP Photo/Jason DeCrow)
More than 2,000 bikers participate in the 2 Million Bikers to D.C. event on Sept. 11. (WTOPDick Uliano)
More than 2,000 bikers participate in the 2 Million Bikers to D.C. event on Sept. 11. (WTOP/Dick Uliano)
The 2 Million Bikers to D.C. brought more than 2,000 bikers to the D.C. area on Sept. 11. (WTOPDick Uliano)
The 2 Million Bikers to D.C. brought more than 2,000 bikers to the D.C. area on Sept. 11. (WTOP/Dick Uliano)
Bikers line up to prepare for their ride in the D.C. area on Sept. 11. (WTOPDick Uliano)
Bikers line up to prepare for their ride in the D.C. area on Sept. 11. (WTOP/Dick Uliano)
An FDNY firefighter stands at attention at 1003 am at a firefighters memorial near One World Trade Center on Wednesday, Sept. 11, 2013, on the 12th anniversary of the Sept. 11, 2001 attacks. This moment marks when United Airlines Flight 93 was forced to the ground by hijackers in Shanksville, Pa., only after passengers tried to save the flight. (AP PhotoCraig Ruttle)
An FDNY firefighter stands at attention at 10:03 am at a firefighter's memorial near One World Trade Center on Wednesday, Sept. 11, 2013, on the 12th anniversary of the Sept. 11, 2001 attacks. This moment marks when United Airlines Flight 93 was forced to the ground by hijackers in Shanksville, Pa., only after passengers tried to save the flight. (AP Photo/Craig Ruttle)
Elena, left, and Elissa Tong mourn their husband and father, Thomas Tong, at the South Pool of the 911 Memorial during ceremony marking the 12th anniversary of the 911 attacks on the World Trade Center in New York, Wednesday, Sept. 11, 2013. (AP PhotoMary Altaffer, Pool)
Elena, left, and Elissa Tong mourn their husband and father, Thomas Tong, at the South Pool of the 9/11 Memorial during ceremony marking the 12th anniversary of the 9/11 attacks on the World Trade Center in New York, Wednesday, Sept. 11, 2013. (AP Photo/Mary Altaffer, Pool)
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