Strange ............. some unasked or unanswered questions.
Was it a service firearm, was it issued to him, was he ordered to go tooled up "just in case".
Did he get as far as putting the ignition key in the car?
Clearly drunk, clearly foolish, but there may be extenuating circumstances.
RAF discipline [outsider speaking] seems to swing wildly from under-reacting to over-reacting these days.
Back to lurking.