It’s likely what we think of as training camps is not what is happening, if this is indeed happening. It’s a good bet it would be a bit more discrete, not out in the open as we would imagine a military training facility. A group could do it anywhere, out of sight. I’m guessing their biggest concerns would be infiltration.
Infiltration by who? Returning veterans, or maybe older veterans, or perhaps US Citizens? At a Farrakan backed islam community service center? Really? Are you a detective?