The military, especially the Army, appears to be not much fun for an INTP until you reach the rank of colonel, where a lot of the bullshit stops and it suddenly becomes important to know the right thing to do to get goals accomplished and whatnot as opposed to swaggering around full of yourself.
The Navy, here and in Britain, as I understand it from afar, might be easier to take as they are very big on "situational authority," regardless of your formal rank. Once you've acquired skills and demonstrated responsibility, you might find yourself in charge of something relatively critical to success of your unit. And that can change and you could move on to something else, different but with your abilities to think and analyze and see a variety of possibilities given some play.
I gave up on the Marines as a valid entity when a friend who enlisted told me they'd been roused out at 2 in the morning to water the parade ground lawn, during a torrential rainstorm. I quite get the concept of conditioning people to obey even incredibly stupid orders, like the Battle of the Somme when anyone with a brain would know they'd die if they went across that field. I just have no room for that much wrongheadedness.
