Secret Service agent stands guard as U.S. President Obama departs on the Marine One helicopter for travel to Colombia for the Summit of the Americas, from Washington

 
Secret Service agent stands guard as U.S. President Obama departs on the Marine One helicopter for travel to Colombia for the Summit of the Americas, from Washington
A Secret Service agent stands guard as U.S. President Barack Obama departs on the Marine One helicopter for travel to Colombia for the Summit of Americas, from the White House in Washington April 13, 2012. REUTERS/Jonathan Ernst