If you received a border certificate, it's because HQ Regiment had received a recommendation from someone in your chain of command that you should have one. If you didn't, it's on someone in that same chain.
Each one was hand signed by the RCO. They were not given to every trooper that served on the border, just because they had been there. If you did not receive one it's because of that, not because someone forgot to give you one.
LRRP/ARP Aero Rifle Plt
Air Cav Trp '74-'77