A fallen tree obstructs traffic at the intersection of Plumb Street and Sweeney Boulevard at Langley Air Force Base, Va., as Hurricane Irene approaches the area Aug. 27, 2011. Joint Base Langley-Eustis implemented evacuations, base closures and infrastructure protection measures to mitigate storm damage at Langley AFB and Fort Eustis. (U.S. Air Force photo by Senior Airman Jason J. Brown/RELEASED)