Airman 1st Class Jacquob Fitzgerald, 28th Civil Engineer Squadron firefighter, tightens his helmet strap during a hazardous material training exercise at Ellsworth Air Force Base, S.D., Oct. 9, 2015. The exercise was held to strengthen the fire department’s team cohesion and improve mission readiness. (U.S. Air Force photo by Airman Sadie Colbert/Released)