U.S. Air Force Tech. Sgt. Matt McDonald, 633rd Medical Support Squadron medical maintenance NCO in charge, prepares the makeup of a simulated injury during a mass casualty exercise at Joint Base Langley-Eustis, Va., April 27, 2017. The 633rd MDSS consists of several offices to include nutritional medicine, resource management, readiness logistics, and administration that work together to provide patient care during an emergency. (U.S. Air Force photo/Airman 1st Class Anthony Nin Leclerec)