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Defense Secretary Leon Panetta is highlighting the contributions of the military in helping avert a repeat of the terrorist attacks of Sept. 11, 2001.

After a moment of silence at 9:37 a.m., the exact time the Pentagon was hit by the hijacked jetliner a decade ago, Panetta paid tribute Sunday to those who have served in uniform in the decade since.

He said more than 6,200 members of the U.S. military have died in the wars in Iraq and Afghanistan since the Sept. 11 attacks.

Vice President Joe Biden also attended the remembrance ceremony, and President Barack Obama plans to lay a wreath at the Pentagon's 9/11 memorial later Sunday.

At Flight 93 memorial, victims' names read

A choir is singing at the Flight 93 National Memorial as the crowd of some 5,000 listened to a reading of the names of the 40 passengers and crew killed aboard the plane a decade ago.

Family members are at the podium reading the names of the victims.

Flight 93 knifed into a rural Pennsylvania field a decade ago Sunday after some of the passengers overcame the plane's four hijackers. Their actions helped prevent a likely attack on Washington by plane.

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