WESTOVER AIR RESERVE BASE, Mass. -- U.S. Air Force Tech. Sgt. Daryl Harper, 439th Aeromedical Evacuation Squadron (AES) aeromedical evacuation technician, checks a simulated patient’s vital signs played by U.S. Air Force Senior Airman Jonathan Wells, 439th AES aeromedical evacuation technician, during a quarterly readiness mission at Westover Air Reserve Base, Mass., Aug. 11, 2012. (U.S. Air Force photo/Staff Sgt. Megan Tomkins)