HOLLOMAN AIR FORCE BASE, N.M. -- Lt. Col. Stephen Russell, 746th Test Squadron commander, discusses the squadron's key role in the Air Force Materiel Command's mission of testing and evaluating Department of Defense guidance, navigation and navigation warfare systems with Gen. Donald Hoffman, AFMC commander, during his visit here, Jan. 21, 2011. While at the 746th, the general got a closer look at a GPS jamming system and a highly-modified ground test vehicle among other test items. (U.S. Air Force photo by Senior Airman Michael Means / Released)
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