Senior Airman Christopher Robnett, 28th Operations Support Squadron aircrew flight equipment technician, performs a mask wipe and bleach procedure with Col. Kevin Kennedy, 28th Bomb Wing commander, during aircrew chemical defense ensemble training at Ellsworth Air Force Base, S.D., May 29, 2014. Part of the training involved processing through an Aircrew Contamination Controlled Area where trainees had to remove their simulated chemically contaminated gear. (U.S. Air Force photo by Senior Airman Anania Tekurio/Released)