Kandahar Airfield

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Afghan security forces inspect damages after clashes between Taliban fighters and Afghan forces in Kandahar Airfield, Afghanistan, Wednesday, Dec. 9, 2015. A Taliban assault on an airport in the southern Afghan city of Kandahar that has been underway for nearly 24 hours has killed dozens of people, the Defense Ministry said Wednesday. (AP Photos/Allauddin Khan)

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Brigadier Gen. Daniel D. Yoo, left, commanding general, Marine Expeditionary Brigad ; Afghanistan, and Sgt. Maj. Doug Berry Jr., sergeant major, MEB-A, exit a UH-1Y Huey following their landing at Kandahar Airfield in Kandahar province, Afghanistan, Oct. 27, 2014. The Marine Corps ended operations in Helmand province and transferred Camps Bastion and Leatherneck to the Afghan National Army.

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Capt. Richard Olson, 74th Expeditionary Fighter Squadron A-10 pilot, gets off an A-10 Warthog after his flight at Kandahar Airfield, Afghanistan, Sept. 2, 2011. (USAF) ** FILE **

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Defense Secretary Leon E. Panetta, soon to step down, addresses the troops during a visit to Kandahar airfield in Kandahar, Afghanistan, on Dec. 13. (Associated Press)

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U.S. Defense Secretary Leon Panetta, left, goes to shake hands with Army Maj. Gen. Robert Abrams, right, after Abrams introduced Panetta to the troops during a visit to Kandahar Airfield in Kandahar, Afghanistan, Thursday, Dec. 13, 2012. (AP Photo/Susan Walsh, Pool)

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U.S. Defense Secretary Leon Panetta speaks to the troops during a visit to Kandahar Airfield in Kandahar, Afghanistan, Thursday, Dec. 13, 2012. (AP Photo/Susan Walsh, Pool)

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U.S. Defense Secretary Leon Panetta speaks to the troops during a visit to Kandahar Airfield in Kandahar, Afghanistan, Thursday, Dec. 13, 2012. (AP Photo/Susan Walsh, Pool)

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Defense Secretary Leon E. Panetta (center) talks with Army Maj. Gen. Robert Abrams (right) and Command Sgt. Maj. Edd Watson during a visit to Kandahar Airfield in Kandahar, Afghanistan, on Thursday, Dec. 13, 2012. (AP Photo/Susan Walsh, Pool)

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Canadian soldiers pay tribute to their fallen comrades during a transfer-of-command ceremony at Kandahar Airfield in Afghanistan on Thursday, July 7, 2011. (AP Photo/Rafiq Maqbool)

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Spc. Gavin Fruge, 22, of Crowley, La., left, watches a rebroadcast of President Barack Obama's speech on proposed troop withdrawal with fellow soldiers at Kandahar Airfield Thursday, June 23, 2011, in Kandahar, Afghanistan. (AP Photo/David Goldman)