Comment by larrywright

If you look at https://globe.adsbexchange.com, and filter for military/interesting (the U button at the top of the screen), you'll see that at any given time there are a LOT of military flights over the US. Most are transport, refueling tankers and what seem to be pilots-in-training (mostly in Texas and Florida, some in Colorado), but there are plenty of helicopters and smaller Lear-type jets. When the president or vice president is flying somewhere there are typically one or more E-3 AWACS planes in the air to provide radar coverage.

There are certainly military planes that fly without ADSB, but for flights where secrecy doesn't matter, they seem to fly with it on. I've seen all manner of planes with ADSB, from U2 spy planes, F-15, F-16, A-10, the occasional B-52, and more.