In 1977, I was preparing several hundred Seaboard Railroad boxcars for scrap in Rocky Mount, NC. In one car, that had been parked on a siding for 5 years or so, under piles of plywood cargo separators, workers found what looked like two green torpedo shipping tubes, about 2' around and 6' long, as I recall. The shipping tags indicated that it was Army cargo, in transit from Viet Nam to Fort Hood, for repair. The tubes were designed to be vacuum sealed, but time had allowed the air back in. One held a mini-gun, the other, wet cell batteries to run it, along with manuals and hardware. Talk about getting your pulse rate up. I'm sure those guns have come a long way since then.. Mac.