Senior Airman Thomas Hollingsworth, 779th Aerospace Medicine Squadron bioenvironmental technician, sanitizes a gas mask before a demonstration, March 16, 2015, on Joint Base Andrews, Md. The flight assists service members preparing for deployment by testing the fit of their gas masks, contributing to the safety of more than 1,400 service members per year. (U.S. Air Force photo/Senior Airman Mariah Haddenham)