Female Marine recruits train on the rifle range during boot camp at Parris Island, S.C., on Feb. 25. The Marine Corps said it has postponed new physical standards that would require women to do three pullups, noting that many female recruits were not yet able to do so. Scott Olson/Getty Images hide caption

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Chinese naval soldiers stand guard on China's first aircraft carrier Liaoning as it travels toward a military base in Sanya, Hainan province, in this undated picture made available on Nov. 30. China Stringer Network/Reuters/Landov hide caption

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A helicopter from the American security contractor DynCorp provides air support as members of an Afghan eradication force plow opium poppies on April 3, 2006, in the Helmand province, Afghanistan. John Moore/Getty Images hide caption

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Pfc. Katie Gorz (center) served as a squad leader during the training at Camp Geiger, N.C. Tom Bowman/NPR hide caption

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A still frame taken from a YouTube video shows Marines who were later disciplined for desecrating three dead Taliban members in a 2011 incident in the southern Afghan province of Helmand. YouTube hide caption

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