U.S. Air Force Staff Sgt. James Terrell, left, and Senior Airman Bobby Chambers, students attending the Engineering Installation vehicle training class, guide a maintenance hole cover in place Dec. 13, 2017, at the Air National Guard Schoolhouse, Fort Indiantown Gap, Pennsylvania. Airmen attending the course learned proper rigging techniques, load weight estimation and weight ratings for chains and straps. (U.S. Air National Guard photo by Staff Sgt. Tony Harp/Released)