STAFF Sergeant (SSGT) William Hartford, USAF, 39th Maintenance Squadron, Conventional Maintenance Crew CHIEF, removes the outer housing of an MAU-169/B Computer Control Group (GBU guidance system) in preparation for repair, during its post twenty-flight inspection at Incirlik Air Base, Turkey. The inspection is conducted every time the component completes twenty flights is to ensure internal computers accuracy and mission capability. The MAU-169/B is used with the GBU-10/B, GBU-12/B and GBU-16/B bombs