Preparing for flight
Airman 1st Class Jennifer Galligher, Aircrew Life Support Journeyman, 18th Aggressor Squadron, inspects a mask for damages Feb. 23, 2008, Eielson Air Force Base, Alaska. The mask is an essential piece of each pilots gear and provides forced oxygen due to the pressure demand system making it easier to inhale during flight at increased altitudes. (U.S. Air Force photo/Airman 1st Class Willard E. Grande II)