Correct. I went to USAFA and at the time we all had M-1s in our rooms for dress/parade and in my case, marching tours. They were inoperable and plugged to prevent firing. The only active weapons authorized to cadets were for pistol/rifle class and those were checked in/checked out and tightly controlled. Will be interesting to see the full story here.
When I was in Coast Guard Boot Camp in 1973 LBJ had just died and we were selected to march in the funeral in DC. We were given M16s to march at sling arms and the Lt who was responsible the check-out and check-ins was sweating bullets when we came back to Cape May as he catalogued each of the 100+ weapons. Could not imagine the hell to pay if one was missing.
Services varied I guess. We kept our M-14 padlocked to our bunks, quite operable of course. Lock went through the safety hole.