A U.S. Air Force Airman, assigned to the 94th Fighter Generation Squadron, prepares to simulate taking cover in a bunker while putting on mission oriented protective posture 4 gear during an exercise at Joint Base Langley-Eustis, Virginia, Oct. 12, 2022. MOPP 4 gear is assumed when there is alarm red, which designates an attack is imminent or in progress and/or contamination is present or suspected to be present. (U.S. Air Force photo by Airman 1st Class Mikaela Smith)