Airmen 1st Class Kenneth Hall, left, and Blake Guiterrez, right, 28th Aircraft Maintenance Squadron weapons load crew members, don mission oriented protective posture gear during a base operational readiness exercise at Ellsworth Air Force Base, S.D., Oct. 20, 2015. MOPP gear is used to protect Airmen in a toxic environment and consists of chemical and biological warfare jacket and pants, protective rubber boots and gloves, a helmet and a gas mask. (U.S. Air Force photo by Senior Airman Rebecca Imwalle/Released)