Airman tests his gas mask for a good seal.
Senior Airman David Nelson, 115th Fighter Wing fuel shop, tests his gas mask for a good seal at the Credit Union building on Truax Field on April 7. Nelson used different breathing techniques and moved his head various directions to ensure his mask had a good seal throughout the testing. Airman at the 115th Fighter Wing just received the M50 gas masks and will all be required to accomplish the fit-tests on their masks. (Air National Guard photo by Andrea F. Liechti)