Pet peeve and rant follows:
Basic trainees were used as interior guards on many posts. "Armed" with empty rifles on remote ranges they were targets. PVT Snuffy challenges some redneck at a back gate only to to get beat up, tied up and relieved of his M16. Only luck might be is the Commander of the Relief should be showing up with his replacement within two hours.
The stupid practice of sentries being required to carry empty weapons has gone on for decades. In the worst cases, during guard mount the soldier was inspected to make sure his ammo pouches were stuffed with newspaper so they looked full.
One post in Germany I remember they kept an ammo can chained and padlocked to the guard shack floor at the main gate. It contained two magazines of five rounds each, to be issued in the event of emergency. The key was kept with the Brigade Duty Officer, a mile and half away.