Gen. Victor E. Renuart Jr., commander of U.S. Northern Command, disembarks an HH-60 Pave Hawk on the Davis-Monthan Air Force Base flightline, April 20, 2010. The general visited the base to observe Exercise Angel Thunder 2010, the largest personnel recovery exercise in the world, held annually at D-M and neighboring areas. (U.S. Air Force photo/Staff Sgt. Jake Richmond)