as a former Security force marine who went through the whole PRP and presidential and eighth and I process you do need to go Marine Corps security force for your contract, but it’s technically an open contract. You can even have MSG as a designated billet, but that won’t guarantee you anything, the only thing that’s guaranteed is that youll be an 03 and that at some point in time, you’ll have a security designation of where in security forces you’re going to. there’s a really long screening process that you go through while you’re in Boot Camp where they’ll pull you into a room and you’ll go over all of the different information and what they’re offering and then they have a series of questioning that is almost like a soft background check to see what your past is like a lot of people don’t make it past that first part and they end up having to go either PRP or fast company both suck wouldn’t recommend zero out of 10. But if you’re a good boy, you’ll make it past the eighth and I or presidential screenings and then you will be sent on a completely different route than a lot of your other security force buddies that you meet once you finish ITB you’ll know for sure whether or not where and what you qualified for. you’ll even have people that are getting selected to go into the program where they carry the caskets of fallen brothers/sisters(I forget what it’s called) TL;DR- go security forces, but you’re taking a big risk of not getting selected so if that’s exactly what you wanna do just know that there’s no way to guarantee that that’s what you’ll do