Guy Bretches pulls clamps off a TF34 jet engine in the 917th Maintenance Squadron Propulsion Flight March 30, 2012, at Barksdale Air Force Base, La. Bretches is conducting an inspection of engine parts to look for damage that might have occurred during an alternative fuel certification process. Bretches is an Air Reserve Technician and A-10 Thunderbolt II jet mechanic assigned to the 917th MXS. (U.S. Air Force photo by Master Sgt. Jeff Walston)