ELLSWORTH AIR FORCE BASE, S.D. – Senior Airman Matthew Halvorson, 28th Civil Engineer Squadron structures journeyman, raises the knees of an exercise victim while he provides self-aid buddy care during a phase II operational readiness exercise, July 20. Raising the knees of the exercise victim helps to prevent the patient from going into shock. (U.S. Air Force photo/Airman 1st Class Matthew Flynn)