917 MXS vital component of A-10 success
Master Sgt. Joseph Densmore, 917th Maintenance Squadron jet engine mechanic, works on the seven stage pneumatic duct on an A-10 Thunderbolt II engine on Barksdale Air Force Base, La., April 5, 2013. The duct is used as a sensing system for the engine. (U.S. Air Force photo/Senior Airman Sean Martin)