Those both sound like good ways to start, I feel like we could work out a few things depending on what way we do start.

I'd say if we start during a firefight, we could say that Marcus might be alone, maybe those he was working with didn't have the best luck, whereas if we start when he's sent in, and maybe with some other spec ops personnel. Seeing he isn't augmented at this point, it'd make sense for him to be with some others.

For me I suppose it comes down to how many NPCs we want to have in the rp, I don't mind playing a few, so i'll leave that up to you :)