I know you are talking bar and not café, but where a camp has a café available to all ranks it is well used. I am thinking Lady Lampson's at Akrotiri, Café Uno? at Air Command and Wittering used to have a Malcom club.
NAAFI hated these encroachments as they perceived it affected their profits and never recognised that they never provided a similar service. These coffee shops provided a neutral all-ranks 'civilian' meeting place.