This is a funny set up, I to was a "waste water marine" with an engineering unit actual job was water purification specialist we sure were special ;). Anyways I volunteered for a summer at a water plant thinking about future careers and there was a large number of veterans working there. I didn't get a feeling they were lying though I was young and naive! Public works does seem like a common employment for the veteran community:
"About 1 in 3 employed veterans with a service-connected disability worked in the public sector
in August 2018, compared with about 1 in 5 veterans with no disability. (See table 8.) "[BLS]
This situation may be more common than we even know.