I got shot through a fire truck once. Front to back, not side to side. I don't know how, I really, really, REALLY don't. I saw the camera, the guy was shooting, and I was around the fire truck, he had an SMG and the round went through the back, came out the front and killed me. The boundaries of logic and reason defy that kill, because in RL...I know a .45 can't go through twenty feet of road vehicle. I know IN GAME that a .45 can't go through that firetruck because I tried to replicate it.
But no, unless the bullet turned right, went alongside the vehicle, turned left to go through a sliver of vehilce before turning right and bursting through the lightweight frame to kill me, I'm at a loss...but this is CoD: MW3 and there are pieces of cloth that stop .50 cal rounds in that game...