How about a mission that starts out as routine, but something discovered during the first stage draws higher up's attention and it actually gets turned into a multi-squad thing, making our guys feel a little pushed aside, because hey, it's our case :P

*Thinks* Yeah, the thing above happens, then the butchering, adding intrigue, and maybe, just a little touch of my old idea, perhaps our guys discovering that the organization itself has connections to the massacre AND the initial job?

OH! If we go with the idea that they are not highly supported by the public I can see most of the workers from more traditional or richer families who see joining the Organization as almost a give-in for a portion of their lives because it's become a kind of tradition. (If we go with this idea, I should warn that my guy will most likly be one of those odd individuals NOT from a rich family and has joined under mysterious circumstances). 

*Shuffles around* I like, and call me weird for it, but I has a liking for adopting in RPs, so if we go with the half breed thing I think ti would be a lot of fun if our guys in some way come to take care of a 7-13 year old half breed, which up til that point had been being raised by human parents, but for some reason or another the parents are now dead. . . .Just an idea that came to me, what cha think?