Navy perhaps? They are the most PC and scared service when it comes to political choices.
My experience (30-yrs: 22yrs active duty and 8yrs with major defense contractor, and I say they are mostly Trump supporters. I will also say when revealing this support for Trump, they are like a lot of Americans, they look around and speak softly. . .).
And of course, whiners and cry-babies in service are mostly Bye-Dumb supporters.
Air Force mainly. Also lots of gov civilians are ‘tards.