seriously?? we have seen the cargo bay in H3- there are no HW vehicles there and there will be nothing UNSC except for what chief has on the ship. It would be a freaking miracle if a unsc ship just HAPPENED to be in the outskirts of nowhere to bring chief a rhino 20 years after they went missing from use. And most of those vehicles were experimental and only exsisted on the spirit of fire- nowhere else. So where in the HELL would chief get those while on the shield world? There wont be covenant or unsc as far as I'm concerned...