Man, those have been flying near my house. One just did last week. A few months prior is when they started, but then it was multiple times in one week. Every single time I would quickly get online and look, but they never, not once were on radar. I would check multiple sites too.
There is a teeny tiny air field in the next town over, and I mean TINY. There is ZERO military bases anywhere near me. Closest one is probably 2+ hours or more away.
I love when I see them, I am just dying to know why they suddenly are flying around here. They are loud af too.