So I'm rewatching MW3's campaig right now and, this is how I think the 4 main ones from Team Metal got their calligns. (these are very silly ngl) Sandman - he fell over once into wet sand and it stuck to his gear. Grinch - his mother chewed him out on call on Christmas one year and he was in a bad mood all day. Truck - he got hit by a truck going 15 kph while singing "you've been hit by, you've been hit by" and got hit right at the cutoff. Frost - he somehow managed to get frostbite on his left pinky toe; he now shows everyone his four-toed foot when he gets drunk.