Courtney Stankavich, 7llth Human Performance Wing research chemist from Wright-Patterson Air Force Base, Ohio, tests the initial air quality inside a C-130J Super Hercules aircraft at Dyess AFB, Texas, Aug. 29, 2020. To understand how quickly air exchanges remove chemical vapors from a particular airframe, the vapor purge team conducted tests to determine the effective air exchange rate which accounts for naturally occurring mixing. (U.S. Air Force photo by Senior Airman Mercedes Porter)