Master Sgt. Edwin Del Valle discusses the electrical system of the C-17 with Maj. Heather Menzies Feb. 22, 2015 during a training mission in San Juan, Puerto Rico. The mission was part of a three day fly-away with Airmen from the 315th Airlift Wing at Joint Base Charleston, S.C. and aeromedical Airmen from the 459th Air Refueling Wing at Joint Base Andrews, Md. The training mission was a cost-effective means to accomplish currency items and evaluations for flight crew members and provided C-17 familiarization and proficiency training for aeromedical Airmen. Del Valle is a flying crew chief with the 315th Aircraft Maintenance Squadron and Menzies is a Stan/Eval flight nurse with the 459th Operations Group (U.S. Air Force Photo/Tech. Sgt. Shane Ellis)