An Air Force E-4B approaches the boom of a KC-135 Stratotanker, assigned to Fairchild Air Force Base, Wash., above the Pacific coast near Canada, April 10, 2014. This refueling mission was in support of Secretary of Defense, Chuck Hagel, on his way back to the U.S. from China. (U.S. Air Force photo by Senior Airman Mary O'Dell)