+Kyle Nguyen Go rewatch the first episode 1 of season 1. Grif specifically says that he signed up to the military to kill aliens, but after the Master Chief defeated the aliens, he was sent to blood gulch.
Spaghetti the TenTac I'm pretty sure that line was ret conned in another season.... I'll have to dig up the info later. Although, I do remember that line in Season 1 and thought it was hilarious.