I had heard rumors that there was an ammo plant in SD and did a google search. this is what I came up with. those rumors mentioned the "federal" brand but I have yet to confirm their relation. http://www.chemringenergeticdevices.com/AboutUs/
Chemring has been in Clear Lake for quite a few years.
I don't know anyone that works down there but I have a few friends around Watertown that know the place.
Like with every other little military contract plant...when orders go down there are layoffs and talk of closing to doors.
There was talk about a buyout last summer or fall, but I don't remember hearing the outcome of it. It wasn't ATK (same group that holds Federal) looking to purchase at that time though.
They're not a regular ammo plant though. Specialized explosive devices for military applications.