Someone in the band can't. Band is almost an entirely different entity. But food services, data systems, admin, they all can. Passing the indoc weeds out all those who can't make it. From what I was told by my PMI who is a Scout/Sniper Instructor and an Operator, anyone can try out, with approval from CoC. Odds are you won't get approved unless you're a **** hot Marine and your MOS can afford to let you go.