Marking the 11th anniversary of 9/11

The Tribute in Light shines as One World Trade Center rises under construction on the eleventh anniversary of the terrorist attacks on lower Manhattan at the World Trade Center on Sept. 11, in New York City.

The Tribute in Light illuminates the sky over Lower Manhattan in remembrance of the 9/11 attacks on the 11-year anniversary in New York on Sept. 11.

People take part in a sunset yoga session as the Tribute in Light shines over the Brooklyn Bridge over the East River on the 11-year anniversary of the 9/11 attacks in New York, on Sept. 11.

Jillian and Eloy Suarez embrace following a ceremony marking the 11th anniversary of the terrorist attacks at the World Trade Center in New York City, Sept. 11. Eloy Suarez was a first responder during the 9/11 attacks. New York City and the nation are commemorating the 11th anniversary of the Sept. 11, 2001 attacks which resulted in the deaths of nearly 3,000 people after two hijacked planes crashed into the World Trade Center, one into the Pentagon in Arlington, Va. and one crash landed in Shanksville, Pa.

The pavilion entrance, center, to the National September 11 Museum is nestled between two reflecting pools at the World Trade Center site on Sept. 11 in New York City. An agreement that paves the way for the completion of the Sept. 11 museum at ground zero was reached on the eve of the 11th anniversary of the terror attacks. The memorandum of understanding between the Port Authority of New York and New Jersey and the foundation that controls the National September 11 Memorial & Museum was announced Monday.

Carrie Bergonia remembers her fiancee firefighter Joseph Ogren after reading his name during observances held on the 11th anniversary of 9/11 in New York City on Sept. 11.

Police officers from the authority pause for a moment of silence marking the 11th anniversary of Sept. 11 near the George Washington Bridge in Fort Lee, N.J. on Sept. 11.

A runner glides his hand at Liberty State Park in Jersey City, N.J., along the wall of 'Empty Sky,' New Jersey's memorial to the 749 people from the state lost during the Sept. 11 terrorist attacks on the World Trade Center, on Sept. 11. The construction of One World Trade Center, now up to 104 floors, is visible in the background. Americans paused again Tuesday to mark the 11th anniversary of the Sept. 11, 2001, terror attacks with familiar ceremonies, but also with a sense that it's time to move forward after a decade of remembrance.

Julia Rivas cries as she holds a photo of her son Moises N. Rivas during the Commemoration Ceremony of the 11th anniversary of 9/11 by the North Pool at the World Trade Center on Sept. 11.

John Cassidy pauses outside of the World Trade Center site in New York City.

Marshall Rodriguez, of New York, holds a flag at the edge of the South Pool in the September 11 Memorial while visiting the names of friends he lost in the 9/11 attacks, Sept. 11.

Firemen pay their respects at the 9/11 memorial during ceremonies for the 11th anniversary of the terrorist attacks at the World Trade Center on Sept. 11 in New York City.

Donn Marshall hugs his son Drake Marshall while visiting his wife Shelley Marshall's memorial bench at the Pentagon 9/11 Memorial after the 11th anniversary ceremony at the Pentagon in Arlington, Va., Sept. 11.

A boulder, top center, that represents the final resting place for the 40 passengers and crew of Flight 93 is viewed by visitors to the Flight 93 National Memorial after a memorial service in Shanksville, Pa., Sept. 11.

A Marine Honor Guard lays a wreath in front of the Wall of Names at the Flight 93 National Memorial during observances commemorating the 11th anniversary of the 9/11 attacks, on Sept. 11 in Shanksville, Pa.

President Barack Obama and first lady Michelle Obama look at headstones during their visit to Arlington National Cemetery on the 11th anniversary of the 9/11 attacks near Washington, D.C., Sept. 11.

U.S. military platoons operating out of Lindsey-Foward Operating Base stand in formation during a brief ceremony in remembrance of those who perished 11 years ago in the 9/11 attacks, in Kandahar province on Sept. 11. The anniversary was muted in Afghanistan, where U.S. and NATO troops organized only small ceremonies to commemorate the deaths of nearly 3,000 people in the worst terror strike on U.S. soil.

President Barack Obama, center, U.S. Secretary of Defense Leon Panetta, left, and Chairman of the Joint Chiefs of Staff Martin Dempsey attend an event commemorating the 11th anniversary of the Sept. 11 attacks, at the site of the attack on the Pentagon near Washington, D.C. on Sept. 11.

Scott Willens, who joined the U.S. Army three days after the terrorist attacks on 9/11, pauses by the South Pool during memorial ceremonies for the 11th anniversary of the terrorist attacks on lower Manhattan at the World Trade Center site, on Sept. 11 in New York City. New York City and the nation are commemorating the eleventh anniversary of the Sept. 11, 2001 attacks which resulted in the deaths of nearly 3,000 people after two hijacked planes crashed into the World Trade Center, one into the Pentagon in Arlington, Va. and one crash landed in Shanksville, Pa.

People observe a moment of silence during ceremonies marking the 11th anniversary of the Sept. 11, 2001 attacks on the World Trade Center at Ground Zero in New York City on Sept. 11.

Christine Gonda places a picture of firefighter George Kane at the engraving of his name at the South Pool, during anniversary ceremonies at the site of the World Trade Center on Sept. 11 in New York City.

Jeremy Hamilton places a U.S. flag next to a memorial bearing two pieces of steel from the World Trade Center in Weehawken, N.J., across from the New York skyline, on Sept. 11.

A woman cries as she leans on a friend near the name of Thomas Tong, at the South Pool wall of the 9/11 Memorial during observances held on the 11th anniversary of the attacks on the World Trade Center in New York, Sept. 11.

Ava Kathleen Schmoelzer, age 7, from Stamford, Conn., places flowers on the South Tower pool wall in memory of her aunt, during observances held on the 11th anniversary of the attacks on the World Trade Center, at the site in New York City, Sept. 11.

Workers unfurl a flag hanging from the wall of One World Trade Center as friends and relatives of the victims of the Sept. 11 terrorist attacks on the World Trade Center attend a ceremony at the National September 11 Memorial at the World Trade Center site in New York City, on Sept. 11.

Peggy Bourke and Susan Friedes listen as names of victims are read during the observances held on the 11th anniversary of the attacks on the World Trade Center, on Sept. 11 in New York City.

Friends and relatives of the victims of the Sept. 11 terrorist attacks look over a reflecting pool during a ceremony at the National September 11 Memorial at the World Trade Center site in New York City, on Sept. 11.

A woman breaks down in tears after reading the name of her father during ceremonies marking the 11th anniversary of the September 11 attacks on the World Trade Center, in New York City, Sept. 11.

Ava Kathleen Schmoelzer, 7, makes a rubbing of her aunt's name, Kathleen Moran, during the anniversary ceremonies at the site of the World Trade Center on Sept. 11 in New York City.

President Barack Obama and First Lady Michelle Obama observe a moment of silence to mark the 11th anniversary of the 9/11 attacks on the South Lawn of the White House in Washington, D.C., on Sept. 11.

Pilsoon Kang pauses during ceremonies marking the 11th anniversary of the 9/11 attacks on the World Trade Center in New York, Sept. 11. Kang lost her son Joon Koo Kang who worked at World Trade Center.

A flower and an American flag are placed next to the names inscribed on the edge of the memorial pool during the observances held on the 11th anniversary of 9/11, on Sept. 11 in New York.

New York City police bugler Gabe Perdomo warms up while standing next to the South Pool during memorial ceremonies for the eleventh anniversary of the terrorist attacks at the World Trade Center site on Sept. 11 in New York City. New York City and the nation are commemorating the eleventh anniversary of the Sept. 11, 2001 attacks which resulted in the deaths of nearly 3,000 people after two hijacked planes crashed into the World Trade Center, one into the Pentagon in Arlington, Va. and one crash landed in Shanksville, Pa.

A woman sits on a memorial bench at the Pentagon 9/11 Memorial prior to the 11th Anniversary ceremony of the 9/11 attacks at the Pentagon in Arlington, Va. on Sept. 11. President Barack Obama and Secretary of Defense Leon Panetta will deliver remarks at the ceremony.

Port Authority Police Officers carry the American flag that flew over the World Trade Center towers during ceremonies at the National September 11 Memorial in New York City.

Maria Rodriguez sits with photos of her son-in-law Emilio Ortiz as friends and relatives of the victims of the Sept. 11 terrorist attacks on the World Trade Center gather for a ceremony at the National September 11 Memorial in New York, Sept. 11.

A small US flag stands at the memorial of the north tower during observances on the eleventh anniversary of the attacks on the World Trade Center, on Sept. 11 in New York City.

The tower known as 1 World Trade Center, left, the National September 11 Memorial, bottom left, and 4 World Trade Center, right, are bathed in light, Sept. 11 in New York.

Visitors to the Flight 93 National Memorial in Shanksville, Pa., participate in a sunset memorial service on Sept. 10.

US Defense Secretary Leon Panetta, center, and Patrick White, second left, a representative of victim's families, visit the crash site a day ahead of the 11th anniversary of the September 11 attacks in Shanksville, Pa., on Sept. 10.