20. Railway equipment repairer (Army)
The Army moves a lot of equipment by rail, but sometimes the railroads in an area of operations have been damaged or destroyed. Since the Civil War, the Army has fielded units to repair rails and operate the trains on them.
https://mycareer.verizon.com/life-at-verizon/military/?source=md-gijobs&utm_source=GI-Jobs&utm_medium=display&utm_campaign=GIJobs-MilitaryTimes
https://mycareer.verizon.com/life-at-verizon/military/?source=md-gijobs&utm_source=GI-Jobs&utm_medium=display&utm_campaign=GIJobs-MilitaryTimes