Truly ironic. Literally about an hour before you posted I visited this thread to see if there were any responses that I happened to have missed.
As for that forum, I just learned of it about two weeks ago while researching another item. It never occurred to me to join and ask about this one. Thanks for that!
I had some just like those back in the 70's when in the USMC. Sergeant E-5 . Looks like for the Khaki uniform shirt. If they were red, would be for dress blues