U.S. Air Force basic military training trainees practice assembling and disassembling their M-16 trainer weapon, May 2, 2019, at Joint Base San Antonio-Lackland. Airmen must know how to fix malfunctions in order to continue the fight and protect their fellow Wingman. Basic military training is an eight-week course designed to challenge Airmen mentally and physically. (U.S. Air Force photo by Sarayuth Pinthong)