From left to right, AIRMAN First Class (A1C) Patrick Navarette, USAF, A1C Joseph D'Antonio, USAF, STAFF Sergeant (SSGT) Christopher Haider, USAF, Technical Sergeant (TSGT) Glenn Swearengin, USAF, SSGT William Hartford, USAF, all with the 39th Maintenance Squadron. They are training on the use of the Tactical Test Unit: 373 A/1 test set, to test the MAU-169/B Computer Control Group for a twenty-flight inspection. The inspection is conducted every time the component completes twenty flights is to ensure internal computers accuracy and mission capability