On tedds hat (the bus driver) it says 'Bloodhound 1304' or '1104'. Bloodhound is a guidance system used in many vehicles. Most commonly found on planes. I then searched 1304 and 1104. I found some information regarding a plane crash in 1961. It is believed that the plane some how crashed into a meteor. Im not too sure how meteors relate to zombies but I think 115 is found in meteors or something. It would be really helpful if someone could get back to me on this.