Fitting faces for fighting capabilities
Senior Airman Lamont Davis, 9th Aerospace Medicine Squadron bioenvironmental technician, starts the gas mask fit test using the Protection Assessment Test Instrument test at Beale Air Force Base, Calif., March 7, 2018. The PATI uses incense to ensure the gas mask has a tight seal. (U.S. Air Force photo by Senior Airman Colville McFee)