U.S. Air Force Staff Sgt. Jasmine Clemons, 633rd Aerospace Medicine Squadron bioenvironmental engineering technician, puts on her gas mask during a hazardous material exercise at Langley Air Force Base, Va., Dec. 18, 2013. The HAZMAT exercise tested the teams’ reaction and accuracy to a chemical emergency. Clemons hails from Los Angeles, Calif. (U.S. Air Force photo by Airman 1st Class Victoria H. Taylor/Released)