Booze = Fraud
No matter how tightly you screw the system down there will always be a way around it. I've lost count of the number of swindles in Malcolm Club bars, Officers' Mess bars, SNCOs' bars, Sporting Club bars and NAAFI bars that I've had to unearth during my time in the Service.
One of the best was at Wittering where booze was being privately purchased and then sold at Club prices over the bar. Totally screwed up the accounts, on occasion but not consistently, and it was ages before we worked out how.
Has stood me in good stead in civvy life where similar ruses have been attempted.