A C-17 Globemaster III prepares to refuel from a KC-135 Stratotanker over the Nevada Test Range during the U.S. Air Force Weapons School Mobility Air Forces Exercise here May 9. The Weapons School holds MAFEX twice a year to test the ability of C-17A Globemaster III and C-130 Hercules aircrews from 12 Air Force bases around the world to join together in a formation at a specific time and location to insert ground forces anywhere in the world. (U.S. Air Force photo/Master Sgt. Robert W. Valenca)