Airman 1st Class Michael Ficken (left), 437th Maintenance Squadron Aircraft Electrical and Environmental Systems specialist, and Senior Airman Paul Wilhems, 315th MXS ELEN specialist, perform a routine maintenance check on a C-17 Globemaster III fire extinguishing system March 18, 2013, at Joint Base Charleston – Air Base, S.C. The fire bottles release an extinguishing agent into the engines of the C-17 in case of an in-flight emergency. Airmen and civilians from the 437th MXS ELEN shop perform maintenance on lighting equipment, motors, batteries, anti-icing controllers, caution and warning panels and many other parts. (U.S. Air Force photo/Airman 1st Class Tom Brading)