U.S. Air Force Staff Sgt. Dylan Crump, 633rd Aerospace Medicine Squadron aerospace and operational physiology technician, briefs Kecoughtan High School Navy JROTC students about the effects of oxygen deprivation on pilots at Joint Base Langley-Eustis, Va., Feb. 28, 2017. The students also toured the 633rd Security Forces Squadron, including the Military Working Dogs and armory, during their visit to the installation. (U.S. Air Force photo/Airman 1st Class Derek Seifert)