Yeah, the pirates, like Slooga, are not the focus of the RP. Characters need to be members of the platoon. If your character wants to go from pirate to platoon, that works, though I'm not sure how it'd work if he were intruder crew. Maybe they took him as a replacement when he pissed off Slooga, and the platoon was like, "Welp, he's army. So he's our concern, not yours."