A U.S. Air Force HH-60 Pave Hawk flight engineer prepares the helicopter for take off while flying in support of the Air Force Weapons School over Nellis Air Force Base, Nev., May 23, 2012. The Air Force Weapons School is a five-and-a-half-month training course which provides selected officers with the most advanced training in weapons and tactics employment. Throughout the course, students receive an average of 400 hours of post graduate-level academics and participate in demanding combat training missions.