A1C Blake Clements, a student at the 344th Training Squadron, reviews the .50-caliber machine gun with Senior Master Sgt. Marc Gibson on June 23, 2015 at Joint Base San Antonio-Lackland, Texas. Gibson, operations superintendent at the 344th Training Squadron, supervises Aircrew instructors and students at the Center of Excellence. (U.S. Air Force Photo/ Tech. Sgt. Carlos J. Trevino)