I don't think I've ever seen a military aircraft on my traffic display.

Mostly agree, including this summer right over Swee****er with 2 F-18s southbound. Have never seen them there before but they did not register as either xpndr or ADSB. The only time I ever saw military fighter register with xpndr was an F-15 with amazingly high closure rate over Lake Tahoe. Likely out of Klamath. It was weird to see the distance in nautical miles decrease at such a rate. There was also a drone near Amadee once cruising at 18k. It seemed to have a xpndr but was much slower. This year various SW airline 737s registered on my ADSB so they seem to be getting equipped.
Darren