He doesn't want me to visit the barracks?

My boyfriend is a Marine and lives in the Barracks, we have been together for 2 months, I have met all of his friends and family but for some reason he won't let me come visit him at the barracks where he lives...I'm just wondering why, he says he doesn't think its a good idea for me to visit him there at all...I know that other marines have their girlfriends visit them on the weekend, so is he so against me going?