When I was attending the University of Alabama back in the 1990s, one of my many work-study jobs was with the Department of Space Management, inspecting all of the spaces within the campus, updating the drawings and assigning room numbers. One of the buildings that I inspected was the ROTC firing range, now demolished in favor of more dorms.
It was a fun place to shoot, especially since they had a huge backlog of .38 S&W and .38 special that needed to be used up.
I helped.
I also helped them to dispose of the used brass, which was usually just stuffed into gunny sacks and then jammed into the crawl space inder the lanes. I declared that this was a safety hazard, as it would impede any attempt to access this space in event of an emergency. I even helped them by hauling this debris away.
The salvageable brass was de-capped, cleaned, resized and mostly sold, with the remainder helping me to learn how to reload modern ammunition (previously I was mostly limited to .22 and muzzle-loaders). The rest was scrapped. This little project brought in some welcome cash for a near-broke student
Most of the pistol ammunition and brass was dated between 1917 and 1957, but all of the loaded rounds worked fine. There was also several hundred pounds of 5.56 brass, but all of that stuff had a much later date. Apparently, AR-15 rifles were no longer being fired on the campus grounds... .