Hey I'm in the Marines and as an INTP, it has been extremely difficult. You're forced to be around others all the time, there are VERY few people who you can actually talk to, there is no personal freedom, and, especially on the enlisted side, the jobs are extremely boring. On the positive side, when you deploy and everything gets hectic, it's like reality catches up with your mind, and while everyone else is stressed you're having a blast. Deployments can also be very good for self analysis, as there is alot of down time, and although you won't find many intellectuals, the military is very diverse and you are accepted for who you with very little bias. I would not reccomend it for any intp, because of how flawed the system is, and how apparent those flaws are, but if there are more reasons why you should versus why you shouldn't, than go for it.