Do you have to be enlisted in the USMC to go to the PLC/OCS/OCC school? Or can you got, pass the OCS and then enlist? If more info. is needed, just ask.
No you absolutely do not need to be enlsited to join the PLC. Im an enlisted Marine and I considered doing PLC, and I went to a few of their meetings (even came close to contracting) and it was chalk full of civilians. In fact, there were more civilians than priors (prior service members).