I'd like to point out that a Space Marine is immune to disease and is practically immortal, the smallest of them is taller than 6 foot ( the largest being over 3 meters), they have enough muscles to squash a human's head like a grape, have acidic spittle, some of them have admantium Wolverine claws, and others of them can pulp entire skeletons without lifting a single finger or moving a foot. Oh, and there is around 100,000 of them currently. Good luck.