Forgot to mention. The " . . special symbol or something . . " would be the battalion's unit crest or distinctive insignia (DI). On a scarlet shield, bear paws and forearms in natural color (brownish) holding aloft a battered, silver, Norman-style Medieval helmet.
If interested, I might be able to locate one for you (I DON'T recommend you pin it to your shoulder or arm).
You might feel the standard Tank Destroyer Forces shoulder patch - the head of a black panther, full-face, crushing a tank in its jaws, centered on a yellowish-orange disc with a thin, black border - would be ideal for a tattoo.