Senior Airman William Murray, 375th Communications Squadron security manager, adjusts the hood of his mission-oriented protective posture training gear on Scott Air Force Base, Ill., Oct. 13, 2020. To complete Chemical, Biological, Radiological, Nuclear training, participants must correctly dress to MOPP level 4, the highest CBRN readiness posture. (U.S. Air Force photo by Airman 1st Class Shannon Moorehead)