Tech. Sgt. Keith Berry scans the flooded streets of New Orleans from a HH-60 Pave Hawk searching for survivors Sept. 4, 2005. A provision of the 2012 National Defense Authorization Act permits the secretary of defense to mobilize Air Force reservists like Berry if they are needed to respond to natural disasters such as Hurricane Katrina. (U.S. Air Force photo/Master Sgt. Bill Huntington)