President Barack Obama walks across the South Lawn of the White House following his return on Marine One helicopter, Tuesday, Aug. 9, 2011 in Washington. Obama made an unannounced trip to Dover Air ... more 
President Barack Obama walks across the South Lawn of the White House following his return on Marine One helicopter, Tuesday, Aug. 9, 2011 in Washington. Obama made an unannounced trip to Dover Air Force Base, Del., to pay tribute to the 30 U.S. troops killed over the weekend in Afghanistan. (AP Photo/Pablo Martinez Monsivais) less 
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Associated Press | Photo By Pablo Martinez Monsivais
Tue, Aug 9, 2011 6:52 PM EDT