Airman Alonzo Kendall, Airman 1st Class Brandon Garcia and Senior Airman Kathryn Beirne, 361st Training Squadron aerospace ground equipment apprentice course students, perform an initial inspection on a new generation heater at Sheppard Air Force Base, Texas, Dec. 15, 2017. The Airmen are in block are in block five of 15 and scheduled to graduate March 12. (U.S. Air Force by Alan R. Quevy)