Aircrew members perform pre-flight checks on a C-17 Globemaster III before take-off to practice combat on-loading and off-loading July 17, 2013, at Joint Base Charleston – Air Base, S.C. Airmen from the 437th Airlift Wing work around the clock on the flightline to provide combat-ready C-17A aircrews, mission support personnel and processes for 53 assigned aircraft to meet White House, Department of State and Joint Chiefs of Staff-directed global deployment, employment and resupply of Department of Defense and allied forces via air-land and airdrop operations. (U.S. Air Force photo/Senior Airman Dennis Sloan)