Center for Strategic Communication

President Obama, Defense Secretary Hagel, and Gen. Martin Dempsey listen to the national anthem, Sept. 11, 2014

President Barack Obama, Defense Secretary Chuck Hagel, and Gen. Martin Dempsey, Chairman of the Joint Chiefs of Staff, listen to the national anthem during the September 11th Observance Ceremony at the Pentagon Memorial in Arlington, Va., Sept. 11, 2014.

(Official White House Photo by Pete Souza)

Thirteen years ago today, our nation was irrevocably changed by horrific acts of terror that took the lives of thousands of innocent people. Across the country, Americans pay tribute to their memories and honor all those who have made great sacrifices in service to our country. 

At 8:46 a.m. ET this morning, the time that the first plane hit the World Trade Center, President Obama, First Lady Michelle Obama, and Vice President Joe Biden joined Americans in observing a moment of silence:

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