McGHEE TYSON AIR NATIONAL GUARD BASE, Tenn. -- Army Lt. Col. Tomas DeLeon, left, and Army Col. John M. Frost, center, receive a tour from Chief Master Sgt. Deborah F. Davidson, right, the commandant of the Paul H. Lankford Enlisted Professional Military Education Center, Dec. 8, 2009. (U.S. Air Force photo by Master Sgt. Mavi Smith/Released)