DEEP BREATHS U.S. Air Force Tech. Sgt. Christopher Genuardi performs breathing techniques during a gas mask fit test on Incirlik Air Base, Turkey, Nov. 21, 2014. The fit test is used to ensure the mask will work properly during emergency situations. Genuardi is assigned to the 39th Civil Engineer Squadron. SHARE: Download: Full Size (0.05 MB) Credit: VIRIN: 083385-Y-EBT82-418.jpg Photo Gallery