U.S. Air Force Senior Airman Isaiah Flemings, 18th Aerospace Medicine Squadron bioenvironmental engineering technician, dons a level-A suit during a hazardous materials incident exercise August 3, 2017, at Kadena Air Base, Japan. Vitals are checked before donning personal protective gear in order to ensure the user is fit for the physical demands of performing duties in the suit. (U.S. Air Force photo by Senior Airman John Linzmeier)