A C-17 Globemaster III is guided into position behind the boom of a KC-135 Stratotanker in order to receive fuel during an in-air refueling training mission near Joint Base Pearl Harbor-Hickam, Hawaii, March 20, 2014. The boom was guided by Airman 1st Class Rebekah McCormack, 96th Air Refueling Squadron in-flight refueling specialist, during her training on refueling procedures. (U.S. Air Force photo/Staff Sgt. Alexander Martinez)