Airman 1st Class Paul Barbagallo troubleshoots a transformer rectifier malfunction during class Aug. 12 at the Electrical and Environmental Apprentice course at Sheppard Air Force Base, Texas. Airman Barbagallo, 364th Training Squadron student, scored a perfect 100 percent on all block tests and was recognized as an Ace Award winner for the course. The course provides training in the knowledge and skills needed to perform maintenance on aircraft and environmental systems; to include aircraft familiarization, maintenance data collection, troubleshooting techniques, wiring, and utility and oxygen systems. (U.S. Air Force photo/Tech. Sgt. Vernon Cunningham)