ELLSWORTH AIR FORCE BASE, S.D. -- Senior Airman Hugh Blacketor, 28th Civil Engineer Squadron heating, ventilation and air-conditioning journeyman, removes a simulated contaminated boot from Airman 1st Class Michael Mays, 28 CES structural apprentice, during a phase II operational readiness exercise, Aug. 24. The exercise is designed to train Airmen on situations that could occur during a real deployment. (U.S. Air Force photo/Airman 1st Class Anthony Sanchelli)