Capt. (Dr.) Joseph Simmerman (center), 82nd Medical Operations Squadron, adjusts the straps on a gas mask during Ability to Survive and Operate training at Sheppard Air Force Base, Texas, June 27, 2018. About 40 Airmen participated in the one-day event that tested their ability to put on protective gear and operate in a deployed environment. (U.S. Air Force photo by John Ingle)