Secretary of Defense Robert M. Gates arrives June 9 to Peterson Air Force Base, Colo. Secretary Gates is visiting Peterson AFB to deliver a speech reinforcing his message that the Air Force must apply more rigor to its responsibilities with nuclear weapons on the heels of the resignation of the Air Force’s top two leaders. Gen. C. Robert "Bob" Kehler, the commander of Air Force Space Command; Gen. Victor E. Renuart Jr., the commander of NORAD – U.S. Northern Command; and Col. Jay Raymond, the 21st Space Wing commander; greeted Secretary Gates upon his arrival. (U.S. Air Force photo/Duncan Wood)