Senior Airman Alexander Ewing and Staff Sgt. Matthew Adelman inspect an universal aircraft tow bar for elongation and metal distortion during a bi-annual inspection on Joint Base Charleston, S.C., Sept. 2, 2010. The tow bar is used to tow almost all different types of transient aircraft that land at JB CHS around the flight line. Airman Ewing and Sergeant Adelman are aerospace ground equipment journeyman with the 437 AGE. (U.S. Air Force Photo/Airman 1st Class Lauren Main)

Airman 1st Class Mae Roles changes an oil filter on a self propelled servicing platform during a routine inspection on Joint Base Charleston, S.C., Sept. 2, 2010. The SPSP is a lift used to assist maintainers when trying to repair or inspect parts of the plane that are high off the ground. Airman Roles is an aerospace ground equipment apprentice with the 437 AGE. (U.S. Air Force Photo/Airman 1st Class Lauren Main)

Senior Airman Aaron Hayden tests the battery voltage with a meter on a B809 generator for proper charging system operations during a semi-annual inspection on Joint Base Charleston, S.C., Sept. 2, 2010. The generator is used to power aircraft while they are stationary on the ground. Airman Hayden is an aerospace ground equipment apprentice with the 437 AGE. (U.S. Air Force Photo/Airman 1st Class Lauren Main)