As I recall, it was possible to become an "Associate Member" subject to the approval at a General Mess Meeting. Mind you, that was many years ago; not sure of today's rules.
Earlier this year members of the local RAFA were invited to lunch at the Mess to celebrate the Platinum Jubilee. The RAFA chairman had to submit our names and car registrations, which were checked at the gate, along with ID (driving licence). We were issued with temporary passes.
So in answer to the OP's question...no. Walt alert.