Wow, there are a lot of people answering that have no clue what they are talking about. When I joined the Marine Corps it was 12 credit hours to be promoted to PFC upon graduation of boot camp.
During training, everyone is a Recruit. Try getting a letter addressed to Private Your Name and see what happens. You aren't a Private at that point. Privates have demonstrated that they can graduate boot camp.
Being a PFC really only puts you a few months ahead of the Privates, as they will be promoted soon after they graduate. In the Corps, being a PFC is essentially the same as being a Private. You will be treated like a Private. You really only start to see a big difference in treatment when you become a Corporal.
My advice to you is to hound your recruiter about getting E-2 in your contract. Your recruiter just thinks of you as another number, and you will probably never see him or her again. Make sure it is taken care of before you leave. Your recruiter is not going to do it on his own.
USMC Enlisted 03-07