With President Obama considering troop withdrawal, look back at the war in Afghanistan -- the longest conflict in U.S. history.
Feb. 27, 2007 -- A suicide bomber attacks the entrance to Bagram Air Base during a visit by Vice President Dick Cheney, killing 23 people. The Taliban claims responsibility, saying Cheney was the target, although he was not injured.
Keystone Resort/Ben Lindbloom
Jessica Rinaldi / Reuters
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