JOINT BASE PEARL HARBOR-HICKAM (July 11, 2016) Lt Col. Ken Humphrey, a pilot with the 465th Air Refueling Squadron, Tinker Air Force Base, Okla., turns a KC-135 while on approach to Hickam Air Force Base, Hawaii, in support of Rim of the Pacific 2016. Humphrey and his crew fly and operate KC-135s out of the 507th Air Refueling Wing at Tinker Air Force Base, Okla. The 507th ARW is the largest Reserve flying unit in the state of Oklahoma. Twenty-six nations, more than 40 ships and submarines, more than 200 aircraft and 25,000 personnel are participating in RIMPAC from June 30 to Aug. 4, in and around the Hawaiian Islands and Southern California. The world's largest international maritime exercise, RIMPAC provides a unique training opportunity that helps participants foster and sustain the cooperative relationships that are critical to ensuring the safety of sea lanes and security on the world's oceans. RIMPAC 2016 is the 25th exercise in the series that began in 1971. (U.S. Air Force photo/Master Sgt. Grady Epperly)