In dream analysis, it often takes a lot more information to find out what a dream means, and a dream 'means' something because it is relevant to your personal history or what is going on currently in your life. Not many people (in psychoanalysis or psychodynamics) still take seriously the idea that there are universal dream symbols. Thus, the short answer is, I can't tell, and nobody can tell unless they know you a bit better.
Try thinking about the details of the dream as well as what being in Marine recruit boot camp means to you. Do you have family or close friends in the military? Does being in boot camp means something to you such as preparing to fight or having your freedom taken away? Elaborating on the dream, and thinking about the connections between what is happening in the dream and in your own life is the best way to interpret the dream.