U.S. Army Staff Sgt. Kevin Shaffer, Charlie Company, 1st Battalion, 210th Aviation Regiment, 128th Aviation Brigade instructor, discusses a computer simulation with Spc. Sherman Amper, 128th Avn. Bde. aircraft electrical student at Fort Eustis, Va., Dec. 10, 2014. Students work on simulations in the classroom before they get hands-on experience maintaining the UH-60 Blackhawk and CH-47 Chinook helicopters. (U.S. Air Force photo by Staff Sgt. Teresa J. Cleveland/Released)