Senior Airman Colin Hayes and 1st Lt. Melissa Mason perform CPR on a mannequin Feb. 21, 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. Hayes is an aeromedical technician and Mason is a flight nurse. Both are assigned to the 459th Aeromedical Evacuation Squadron. (U.S. Air Force Photo/Tech. Sgt. Shane Ellis)