Air Force definitely more left leaning.
Not sure how you formed this opinion. I was in the USAF from Carter through Clinton. Enlisted and commissioned. I never met anyone who was "left leaning". Most people were conservative though not necessarily Republican. Clinton was hated and he made no secret he hated us. Carter was despised. Regan and both Bushes were popular.
I'm retired from flying now but I teach part time at a training facility where certain USAF pilots train. They couldn't stand Obama's PC, gay loving, anti-American bullshit. I have yet to hear any of them comment on Trump.