U.S. Army Pvt. Austin Byrd, 128th Aviation Brigade medium helicopter repair Advanced Individual Training student, troubleshoots and repairs a piece of equipment in the Chinook CH-47 training aircraft at Fort Eustis, Va., June 17, 2014. Students gain practical knowledge through these instructor-supervised exercises. (U.S. Air Force photo by Airman 1st Class Kimberly Nagle/Released)