A U.S. Air Force F-16 Fighting Falcon aircraft pilot communicates with the boom operator aboard a KC-135 Stratotanker aircraft, top, assigned to the 507th Air Refueling Wing July 26, 2014, during an aerial refueling near Hawaii during Rim of the Pacific 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.