ELLSWORTH AIR FORCE BASE, S.D. -- (Left to right) Airman 1st Class David McMillen, 28th Civil Engineer Squadron, heating, ventilation and air-conditioning apprentice and Master Sgt. Lee Greenwell, 28 CES water and fuels systems craftsman, secure a simulated patient to a stretcher during a Phase II Operational Readiness Exercise, Sept. 16. Airmen are tested on their skills in self-aid buddy care during the exercise. (U.S. Air Force photo/Airman 1st Class Anthony Sanchelli)