Had a cousin that did the same thing during Vietnam. Had a draft number of something like 12. Went and joined the Navy as some type of radio communications geek thinking even if he gets sent to Vietnam, he'll be safety off the coast on a ship. Finishes training at Great Lakes and gets sent over to the fleet off the coast and ends up on a aircraft carrier. Thinks to himself, "This is great, combat pay, nobody shooting at me, three hots and a cot and all I'll do is fix radios or some such."
Later that day a CPO calls all the new guys up to the hanger deck, lines them up and has them count off by eights.
My cousin being puzzled by this asks "Chief, why are we counting off by eights?"
"That's your river boat number."
Spent 13 months in the Brown Water Navy on the Mekong.
So much for trying to outsmart Uncle Sugar.