What do you mean replace it?
OFFUTT AIR FORCE BASE, Neb. -- Jon Pieters, a readiness technician with the 55th Civil Engineering Squadron, inspects a gas mask while Tech. Sgt. Jacqueline Brown and Tech Sgt. Juliana Fleming, both with the 55th Force Support Squadron, look on during an expeditionary training day here Aug. 20. The training day consisted of self aid buddy care, post attack reconnaissance sweeps and the proper donning of chemical gear. U.S. Air Force Photo by Jeff W. Gates