A large majority of military personnel are conservatives.

Like the other guys data pointed out, this isnt as true as it used to be.

However, his data also leaves out a little bit of info that was found in another one I saw: Almost all of the left-wing shift in the military was concentrated among the General Staff and extremely high level officers. The actual trigger-pullers, NCO's, and field officers? Still largely conservative or libertarian. Marines being the single largest profession of donors to Trump, and it wasnt even close

So take heart in that I suppose.

EDIT: Sidenote, I like this channel, and have been watching him for well over a year. He had another video I posed about back then that he outlined what the 21st century would ultimately become, and its good for us who value freedom and liberty.