This is the USTDC name tag that Sarj Bloom wore while at TDC in 1962-1963. It was made of metal and had pins on the back which held it onto the plastic case. At the top of the case was a slit so that it could be placed over a button on the uniform.
I don't recall that we had special name tags when I was there in 1973-1974, but we did have this USTDC badge that we pinned to one of our breast pockets (right, I think) of our uniforms.
Actually, now that I've thought about it, we may have had a leather backing for this thing that we buttoned to our breast pocket. If anyone knows for sure, please enlighten this aging veteran.