PHOTOS COURTESY OF DEPARTMENT OF DEFENSE, UNLESS OTHERWISE NOTED
A platoon sergeant orders Marines to clear a building in Fallujah, Iraq, in 2004.
These airmen are all smiles after returning from Europe in 1945. (NATIONAL ARCHIVES)
Marine Corps recruits prepare for a martial arts training session.
Newly freed prisoners of war celebrate as their C-141A aircraft lifts off from Hanoi, North Vietnam, on Feb. 12, 1973.
Bernice Haydu, a member of the Women Airforce Service Pilots during World War II, stands next to an AT-6 Texan.
World War II-era P-51 Mustangs fly in formation.
Army Major Zach Rolf poses for a photograph with his father and Vietnam War veteran, Lynn Rolf.
Marines and sailors serving in Iraq hold up Thanksgiving Day cards made by a kindergarten class from Island Creek Elementary School in Alexandria, Va., in 2007.
Edgar Harrison and Delton Walling, Pearl Harbor survivors, applaud during a Dec. 7, 2012, remembrance ceremony at the World War II Valor in the Pacific National Monument in Honolulu.
Rolling Thunder participants gather on May 29, 2016. The annual ride brings together veterans and others seeking to pay respects to those who have served.
A look through the cockpit of a World War II B-29 bomber sitting on display.
Captain Louis Zamperini (left) makes a broadcast to the United States after spending 28 months in a Japanese prison camp. (NATIONAL ARCHIVES)