M1955 Uniforms and Insignia!

[Nack]

The general question is did all shoulderboards during this era, other than infantry, have branch-of-service devices on them?

I'd like to know because I have acquired an officer gym with narrow silver shoulder boards, red piping, 3 large gold stars. Shoulderboard buttons dated 57 and 58, other buttons undated. I figured that it is a M55 officer's service tunic. Given the narrow boards, silver color, and red piping, it should be medical or legal right?

However, in the only reference I have on m55 and m58 uniforms, it shows that there should be a branch-of-service device on all shoulder boards, other than infantry. These boards have none, and never did, as the silver is quite tarnished and there are no bright spots were there might have been such devices. Can anyone help me out?