Me too. I always live off post when I have the option. When at the Presidio of Monterey, the only housing I could afford with my number of dependents on my BAH was the former Ft. Ord housing. It had a policy that all firearms must be registered with the post PD within 30 days. I left all of my guns at home, and when I was ready to PCS back to Utah, I had a friend bring my 1911 less than 30 days from my move date so that I wouldn't be in violation of the policy. I strapped it on when I crossed the Nevada border.
That memo is someone's idea of being clever. I would take a picture, follow it up to wherever it came from, and have a frank discussion with whatever leader had it posted. In a society that has become so hypersensitive to offending people, and in an army where political correctness is overtaking the mission in priorities, this is absolutely sickening, that gun owners can be insulted and discriminated against so freely. I would go to IG because it is creating a hostile work environment. Un freakin acceptable.