Airman 1st Class Garrett Garza, 60th Aircraft Maintenance Squadron Dash 21 technician, stands with dozens of oxygen bottles maintained by the Dash 21 shop at Travis. 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)