Pontius Navigator:
No mere gp capt would dare to cross the lowly NAAFI as they had a monopoly on overcharging and underselling.
Er, well one did to my certain knowledge, Station Commander RAF Changi in the 60's. He backed up OC 48 Sqn who turned to a local contractor to provide refreshments to the Squadron, and in particular to the groundcrews on the nightshift as the local NAAFI manager said it was uneconomic, never mind
Servitor Servientium. That arrangement persisted through the change from Hastings to Hercules until the latter left Singapore.