U.S. Army Staff Sgt. Kevin Shaffer, Charlie Company, 1st Battalion, 210th Aviation Regiment, 128th Aviation Brigade instructor, observes Pvt. Timothy Beasley, 128th Avn. Bde. aircraft electrical student, troubleshoot the Caution Advisory System on a UH-60 Blackhawk trainer model helicopter at Fort Eustis, Va., Dec. 10, 2014. Shaffer said he hopes his students learn as much as possible regarding maintaining an aircraft, but that they ask for help if they are not sure how to do something. (U.S. Air Force photo by Staff Sgt. Teresa J. Cleveland/Released)