out of all of the groups of halo i think the marines r the softest cause there is a level on halo 3 were as soon as u walk in the room u see a marine go flying man . The only reason the marines won was the spartan. If he wasnt there, they would of been gone in halo 1 . fo real i kinda think if the flood would have team up with the covenent . They could of beat the marines with or without the spartan.