Fit Test
DYESS AIR FORCE BASE, Texas -- Staff Sgt. Andres Rodriguez and Senior Airman Javier Martinez plugs a tube into Airman Martinez's gas mask, April 4. Every Airman must have a fit test on their gas mask before a deployment or chemical warfare training. The tube will measure the amount of particles inside the gas mask and outside, you can only pass if the ratio between the two are at the right levels. (U.S. Air Force photo by Airman 1st Class Jennifer Romig)