[edpc]

I’ve noticed they’ve used Bears and all of their incursions. I asked someone who knows more than a little bit about the subject why their Backfires and Blackjacks are never used in these drills. He said it’s likely they are trying to keep avionics signals and radar signatures under wraps as much as possible. When they start being seen, I’d probably get a little nervous.

[GBA]

That's what I would have thought if they hadn't said "invisible to Air Traffic Control".

Those old Bears aren't, but I'm pretty sure this one is invisible to ATC: