A C-17 Globemaster III sits on the parking ramp at Joint Base Charleston during a sunrise Feb. 4, 2010, before an evaluation flight. More than 50 aircraft are assigned to the base and are flown during execution of training and real-world missions 24 hours a day, seven days a week, providing airlift, air delivery, aeromedical evacuation and humanitarian aid. (U.S. Air Force photo by Tech. Sgt. William Greer)

U.S. Air Force 1st Lt. Ryan Cox briefs crew members here before taking off for an evaluation flight aboard a C-17 Globemaster III Feb. 4, 2010. The flight was part of a routine training mission to help aircrew hone their skills through multiple training scenarios all intended to expand global reach. Lieutenant Cox is a pilot with the 17th Airlift Squadron. (U.S. Air Force photo by Tech. Sgt. William Greer)

U.S. Air Force Capt. Brad Bowyer conducts his pre-flight inspection of a C-17 Globemaster III on the flightline here Feb. 4, 2010. The mission was flown as part of an evaluation to keep aircrew skills sharp and ready to perform duties anywhere, anytime. Captain Bowyer is a pilot with the 17th Airlift Squadron. (U.S. Air Force photo by Tech. Sgt. William Greer)

U.S. Air Force Capt. Brad Bowyer inspects the landing gear of a C-17 Globemaster III here Feb. 4, 2010. Prior to each mission, the aircrew inspects aircraft maintenance documentation and performs a visual check of the aircraft to ensure it is ready for flight. Captain Bowyer is a pilot with the 17th Airlift Squadron. (U.S. Air Force photo by Tech. Sgt. William Greer)

U.S. Air Force Capt. Brad Bowyer reviews his maps and flight plan in preparation for takeoff aboard a C-17 Globemaster III here Feb. 4, 2010. The mission was flown as part of an evaluation to keep aircrew skills sharp and ready to perform duties anywhere, anytime. Captain Bowyer is a pilot with the 17th Airlift Squadron. (U.S. Air Force photo by Tech. Sgt. William Greer)

U.S. Air Force Capt. Erika Meyers reviews technical orders during pre-flight checks before takeoff aboard a C-17 Globemaster III here Feb. 4, 2010. The flight was part of a routine training mission geared toward perfecting the skills and knowledge required to perform aerial duties. Captain Meyers is a pilot with the 17th Airlift Squadron. (U.S. Air Force photo by Tech. Sgt. William Greer)