Of course the military has an indirect affect on civil aviation from the standpoint of training new pilots.

Fewer and fewer tails manned and otherwise require less in the way of pilots who can go on to fly for the airlines. CCA Collaborative Combat Aircraft (CCA), USA - Airforce Technology (airforce-technology.com) is the way of the future. IMHO. 20 ish B-2s 75 ish B-52s for instance. Even the B-21 as a replacement will likely be less than 175 tails total but you get the idea. Not many compared to most civil airline fleets.

On another note the war in Ukraine has really been an eye opener in how wars of the future can go. The Army canceled the FARA largely based on lessons learned in that environment.

There's also been discussion on cancelling NGAD but that appears to be because of the cost and realistically political posturing I'm sure plays into that. We'll see.

Finally we have the SR-72 that would most likely be unmanned assuming it exists and in what form but the whole project is almost like UFO sightings so details are sparse for now.