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CAMP BLESSING, AFGHANISTAN - OCTOBER 22:  Artilerymen await coordinates before firing a 155mm Howlitzer on a Taliban position October 22, 2008 from Camp Blessing in the Kunar Province of eastern Afghanistan. Their unit, Charlie Battery, 3rd Battalion of the 321 Field Artilery, has fired more than 5,900 shells since it deployed to Afghanistan less than a year ago, making it the busiest artilery unit in the U.S. Army, according to to military officers. They most often fire in support of Army infantry units battling Taliban insurgents in the nearby Korengal Valley, site of some of the heaviest fighting in Afghanistan.  (Photo by John Moore/Getty Images)
CAMP BLESSING, AFGHANISTAN - OCTOBER 22:  Artilerymen await coordinates before firing a 155mm Howlitzer on a Taliban position October 22, 2008 from Camp Blessing in the Kunar Province of eastern Afghanistan. Their unit, Charlie Battery, 3rd Battalion of the 321 Field Artilery, has fired more than 5,900 shells since it deployed to Afghanistan less than a year ago, making it the busiest artilery unit in the U.S. Army, according to to military officers. They most often fire in support of Army infantry units battling Taliban insurgents in the nearby Korengal Valley, site of some of the heaviest fighting in Afghanistan.  (Photo by John Moore/Getty Images)

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President Trump details the future of the US military's involvement in Afghanistan during an address at Joint Base Myer-Henderson Hall in Arlington, Virginia.

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President Trump details the future of the US military's involvement in Afghanistan during an address at Joint Base Myer-Henderson Hall in Arlington, Virginia.