While I have seen badges from varying services on tunics, I have never seen a "repeat" badge award. For example, I have seen Heer badges on Luftwaffe tunics. I have never seen or heard of evidence of members wearing badges for the same thing on their tunic at the same time. Maybe this veteran was placing every badge he was ever awarded on that ribbon bar. Perhaps he was awarded the Heer Flak badge and was assigned to the LW where he would have been allowed to wear the Heer badge until he qualified for the Luftwaffe badge. Just a theory.