JOINT BASE PEARL HARBOR HICKAM, HAWAII (July 10, 2010) U.S. Air Force Master Sgt. Alvin Kuper, boom operator, assigned to the 465th Air Refueling Squadron, Tinker Air Force Base, Okla., completes a pre-flight checklist aboard a KC-135 Stratotanker for an air refueling mission in support of exercise Rim of the Pacific (RIMPAC) at Hickam Air Force Base, Hawaii, on July 10, 2010. RIMPAC is a biennial, multinational exercise designed to strengthen regional partnerships and improve interoperability. RIMPAC includes more than 14 nations 32 ships, five submarines, more than 170 aircraft and more than 20,000 Soldiers, Sailors, Marines and Airmen. (U.S. Air Force photo by Staff Sgt. Kamaile O. Long/Released)