When my son was in rotc a few years ago while in high school. He went to Fort Knox Summer camp every summer. There he got to shoot m-16's and do other assorted military stuff like repell with his ranger team and shoot m-16's with his rifle team. In fact he got expert marksman with it. I was proud of my boy for being both on the ranger team and rifle team and excelling at both. He had worlds of fun there. But yes it is very secure. At one time they had most of the worlds gold there but not anymore. It has since been moved to another location. I think somewhere in NYC.