United States Army

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President Obama walks Aug. 31, 2012, on the tarmac upon his arrival at Biggs Airfield at Fort Bliss, Texas, with Gen. Lloyd Austin (right), vice chief of staff of the U.S. Army, to greet members of the military and their families. (Associated Press)

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U.S. Army Gen. Martin Dempsey, chairman of the Joint Chiefs of Staff, talks to American service members with the International Security Assistance Forces in Kabul, Afghanistan, on Monday, Aug. 20, 2012. (AP Photo/D. Myles Cullen, Department of Defense)

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In this Wednesday, May 30, 2012 photo, U.S. Army Sgt. Josh Olson is photographed on the shooting range after practice at Fort Benning, Ga. Olson was on a routine patrol in Tal Afar, Iraq, when a grenade that was lobbed at his Humvee exploded. He lost his right leg in the attack, and would end up spending 18 months at the Walter Reed National Military Medical Center. It was during that time that he took a trip to a shooting range, and impressed officials from the U.S. Army with his marksmanship, becoming the first athlete with a physical disability to be nominated to the Army's World Class Athlete Program. Now, Olson is setting his sights on a gold medal at the Paralympic Games in London. (AP Photo/David Goldman)

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Defense Secretary Leon E. Panetta and U.S. Army Gen. Martin Dempsey, chairman of the Joint Chiefs of Staff, confer on Capitol Hill in Washington before testifying before Congress on Thursday, April 19, 2012. (AP Photo/J. Scott Applewhite)

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Photographs by U.S. Army via the Associated Press U.S. Army, Col. Val Keaveny Jr., commander of the 4th Brigade Combat Team, 101st Airborne Division, pins Herbert Suerth II, a World War II veteran of Easy Company, 506th Parachute Infantry Regiment, as a Distinguished Member of the Regiment during a ceremony at Fort Campbell, Ky.

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U.S. Army UH-60 Black Hawk helicopters arrive to pick up soldiers during an exercise at Fort Campbell, Ky., for Week of the Eagles. (Image: U.S. Army) ** FILE **

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USA Basketball guard Kevin Durant, left, shakes hands with U.S. Army Corporal Cody Stanton after a practice Saturday, July 14, 2012 in Washington. (AP Photo/Alex Brandon)

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FILE - In this Feb. 19, 2012, Ryan Newman drives his car during qualifying for the NASCAR Daytona 500 auto race in Daytona Beach, Fla. The U.S. Army will not return to Stewart-Haas Racing next season, citing a reallocation of its marketing budget that does not include a presence in NASCAR. SHR said Tuesday, July 10, 2012, it is pursuing a new sponsor. (AP Photo/Reinhold Matay, File)