221116-F-FH810-1227
U.S. Air Force Airmen from the 673d Mission Support Group gear up to Mission Oriented Protective Postures (MOPP) Level Four during a training scenario for Exercise Polar Force 23-2 at Joint Base Elmendorf-Richardson, Alaska, Nov. 16, 2022. There are five MOPP levels: MOPP 0, MOPP 1, MOPP 2, MOPP 3 and MOPP 4, with MOPP 4 requiring service members to put on their gas masks, boots, gloves, vests and helmets in response to a potential chemical, biological, radiological or nuclear threat. Readiness exercises like Polar Force allow service members to train in a simulated contested environment, with this exercise testing a member’s ability to survive and operate (ATSO). (U.S. Air Force photo by Airman 1st Class Quatasia Carter)