With President Obama considering troop withdrawal, look back at the war in Afghanistan -- the longest conflict in U.S. history.
April 22, 2004 -- Former NFL star Pat Tillman is killed in a friendly fire incident during a firefight with hostile forces in Sperah, Afghanistan. The Army first reported that Tillman had been killed by enemy fire, and then Lt. Gen. Stanley A. McChrystal approved the award of a Silver Star.
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National Portrait Gallery, London
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