Members of the U.S. Army prepare a UH-60 Black Hawk for refueling after landing at Davis-Monthan Air Force Base, Ariz., Feb. 7, 2014. The aircraft and personnel, assigned to the 3-227th Assault Helicopter Battalion, 1st Air Cavalry Brigade, 1st Cavalry Division out of Fort Hood, Texas, refueled at D-M before continuing to California where they will participate in a training exercise. (U.S. Air Force photo by Airman 1st Class Betty R. Chevalier/released)