A U.S. Air Force KC-135 Stratotanker aircraft assigned to the 507th Air Refueling Wing sits on the flight line at Joint Base Pearl Harbor-Hickam, Hawaii, July 22, 2014, before conducting an aerial refueling mission to provide fuel to F-22A Raptor aircraft and F-16 Fighting Falcon aircraft during Rim of the Pacific (RIMPAC) 2014. RIMPAC is a U.S. Pacific Fleet-hosted biennial multinational maritime exercise designed to foster and sustain international cooperation on the security of the world's oceans. (U.S. Air Force photo by Senior Airman James Richardson/Released)