My recruiter wants me to sign a contact that’s under open contract for special operations but I want a contract for PJ. I’m worried that they will put me wherever after selection.

SW is going to more Open SW contracts. It allows them to not force jobs on you and also gives you the ability to interview SW career fields to find if you are a better fit. You will choose your job at SW prep,  no one at SW Prep will force you to make a decision you don’t want to make.