An Airman tightens his gas mask while putting on his Mission Oriented Protective Posture gear, during a training day at the Warfighter Training Center, Wright-Patterson Air Force Base, Ohio, Aug. 28, 2019. The training day also included topics such as self-aid buddy care, and how to assemble, disassemble, and handle an M4 Carbine Rifle. (U.S. Air Force photo by Wesley Farnsworth)