As an RNZAF Flt Lt in ANZUK [74-76], I briefly lived in Hyde Park Gate at Seletar, which [Station] had been taken over by the Singapore Armed Forces. The SAF had taken over the security on the gate from the RAF Police, and were very keen to show they could do the job. I always wore my SD hat [it fitted quite nicely in my standard issue Aussie Holden], so I was always smartly saluted on entry, with my Seletar Pass handy, but I discovered to my dismay one day that my wife had long since lost her pass, but was happily waving a Wellington City Council Library card every time she came in. She smiled with it and was never stopped!
I wouldn't have dreamed of going anywhere without my hat by the way!