The real “reason” for the current weapons restrictions on military installations is that the appointed head of “Homeland Security” under the Obama administration imposed many unconstitutional restrictive measures on installation commanders. The most intrusive of which is that ALL FIREARMS TAKEN ONTO AN INSTALLATION MUST BE REGISTERED WITH THE PMO. The next most intrusive and again unconstitutional measure is that REGARDLESS OF STATE LAW no one other than CID and DoD police are allowed to carry concealed or open unless actually on duty. (This one even “re-defines” what on duty means because military personnel have always been on duty 24/7 and subject to immediate deployment and they still are but they are “on duty” for purposes involving being armed ONLY while performing that scheduled shift requiring it.)
Such regulation is required Congressional Approval before implementation but these restrictive regulations and changes to previous regulations involving Arms on military installations by “Homeland Security” simply skipped over that requirement so Congress, OUR ELECTED REPRESENTATIVES” have never had an opportunity to approve nor disapprove them.