As a full-time Blackhawk helicopter crew chief, Staff Sgt. Chad W. McCann of Deville, La., works carefully to correct a malfunction in the engine compartment of a UH-60 Blackhawk at Army Aviation Support Facility #2 in Pineville, La. McCann is one of many Soldiers of the 812th Medical (Air Ambulance) Company who will transition to newer model helicopters as OH-58 Kiowa and UH-1 Huey become obsolete in the Louisiana National Guard.