171129-F-ST721-016
Tech. Sgt. Sean Preston, 433rd Maintenance Squadron aerospace propulsion technician, briefs students on the new F-138 engine that the C-5M Super Galaxy aircraft uses November 29, 2017 at Joint Base San Antonio-Lackland, Texas. The students also visited the fabrication and sheet metal shop before touring a C-5M Super Galaxy aircraft. (U.S. Air Force photo by Benjamin Faske)