I did try to bring it back to a military theme by enquiring how people felt about a "No Servicemen" policy. Sadly no one bit.
I agree with the OP on one point that it would be nice to have a consistent rule. As a parent one never knows whether one is likely to be made welcome, summarily ejected, or allowed to stay but treated like toxic waste. Even coloured people in apartheid South Africa at least knew where they stood.