U.S. Army Staff Sgt. Scott Kirchman, 128th Aviation Brigade instructor, demonstrates for Under Secretary of the Army Joseph W. Westphal, how to troubleshoot a fault on a Chinook helicopter at Fort Eustis, Va., August 7, 2013. The 128th Aviation Brigade is responsible for training Serivce members on how to maintain a variety of different helicopters. (U.S. Air Force photo by Staff Sgt. Wesley Farnsworth/Released)