At Gutersloh in '86 or'87 18 Sqn had a visit from one of the German Army CH53 sqns. After a couple of days flying in each others aircraft and exchanging stories of daring do, the visit was rounded off by a cultural evening involving the inevitable Hubie schnapps and copious draughts of Germany's finest ales. The following morning through bleary eyes and with banging heads we lined up to bid our fellow aviators farewell. The Germans took off and did a quick circuit to position for a fly past. As they banked away after a grass skimming run through we noticed that our engineers had added a 'C' and an 'S' at either end of the word 'HEER" which was written on the underside of each aircraft.
Whilst we all saw the funny side of the jape our Sqn boss was not as impressed after a rather lengthy one sided phone conversation with the Commander of the German's home base.