U.S. Army Staff Sgt. Kevin Shaffer, Charlie Company, 1st Battalion, 210th Aviation Regiment, 128th Aviation Brigade instructor, observes Pvt. David Benfer, 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 teaches between 30 and 40 students each year, some who request him as their mentor after they graduate. (U.S. Air Force photo by Staff Sgt. Teresa J. Cleveland/Released)