Between two farm fields in Sharpsburg, Md., there was a sunken road, which Confederates used as a rifle pit until they were overrun by federal troops. The road has since been known as "Bloody Lane." Library of Congress hide caption

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Spc. Ben Purvis (center) helps train Afghan troops on how to use mortars in the eastern province of Kunar in June. The top U.S. commander in Afghanistan, Gen. John Allen, points to several factors in the rise of "insider attacks" on American forces. He says relations between U.S. and Afghan troops are good overall. Lucas Jackson/Reuters/Landov hide caption

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Gen. Norton Schwartz (shown here in October 2010) is stepping down as the top U.S. Air Force officer. Tim Sloan/AFP/Getty Images hide caption

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U.S. investigators allege that Afghan Gen. Ahmad Zia Yaftali stole tens of millions of dollars' worth of medicine from the Mohammad Daud Khan military hospital in Kabul. He has been removed from that post, but has not been prosecuted. He's shown here at the hospital on Dec. 18, 2010. Altaf Qadri/AP hide caption

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Capt. Jared Larpenteur plans a combat mission at the 82nd Airborne's Delta Company command center in Ghazni province, Afghanistan, earlier this year. Amy Walters/NPR hide caption

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Marines with Echo Company of the Second Battalion, Ninth Marines out of Camp Lejeune, guide their M-ATV, a Mine Resistant Ambush Protected vehicle in to the district government compound in Marjah, Afghanistan. David Gilkey/NPR hide caption

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Bagi Kheyl, in the eastern province of Ghazni, is one of the villages where the 82nd Airborne has been operating as part of a broader effort to drive away the Taliban. Amy Walters/NPR hide caption

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Afghan local police officers wait outside a classroom at a training facility in Marjah. U.S. Marines are training local security forces how to maintain calm in the region. David Gilkey/NPR hide caption

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