Senior Airman John Henry (right), 28th Medical Operations Squadron ambulance services technician, checks the blood pressure of Airman 1st Class Zach Piper, 28th MDOS bioenvironmental engineering technician, during an emergency response training exercise on Ellsworth Air Force Base, S.D., May 23, 2013. Ambulance services technicians recorded the vital signs of Airmen before and after they responded to a simulated fluid leak to monitor any adverse effects from wearing a Level A hazardous material suit or after simulated exposure to an unknown fluid. (U.S. Air Force photo by Airman 1st Class Ashley J. Thum/Released)