U.S. Air Force Staff Sgt. Justin Hartsock, with the 552nd Aircraft Maintenance Squadron, salutes as an E-3 Sentry aircraft, not pictured, taxis at Joint Base Pearl Harbor-Hickam, Hawaii, July 24, 2014, 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.