M50 gas mask, breathe easy
ROYAL AIR FORCE LAKENHEATH, England -- Keisha Faw, 48th Aerospace Medicine Squadron gas mask fit tester, directs Capt. Tony Kasallis, 48th Dental Squadron general dentist, on different exercises to perform when fitting for a gas mask at the deployment center Sept. 22. A series of five different exercises lasting 40 seconds each, are done to make sure each mask is fitted properly. (U.S. Air Force photo/Airman 1st Class Lausanne Morgan)