The Three Musketeers is one of my favorite novels, so to say I love this picture would be an understatement. Definitely awesome.
Seems obvious that Andou is Porthos and Oshida is Aramis, but what's interesting is that Marie could be both Athos, as she's the leader of BC Freedom, and d'Artagnan, as she's what can be considered the main character of her squad and also looks younger than her teammates.