Airman 1st Class Garrett Garza, 60th Aircraft Maintenance Squadron, stands with dozens of oxygen bottles on Oct. 7, 2011, maintained by the "Dash 21" shop at Travis Air Force Base, Calif. Garza and the Airmen he works with are responsible for making sure their aircraft equipment is up to date and serviceable for those who will later fly the plane. (U.S. Air Force photo/Staff Sgt. Patrick Harrower)