Chief Petty Officer Walter "The Beast" Lynch, often simply just "Beast," was an engineering department Chief aboard the USS John Paul Jones. He served under acting commanding officer LT Alex Hopper. He had a personal encounter with the aliens in the engine room of the USS John Paul Jones, shortly after LT Hopper took command, in which he was nearly killed and would have been if not for the timely intervention of LT Hopper and GM2 Raikes who were searching the ship for the alien.
CPO Lynch survived the destruction of the John Paul Jones by the shredder drones, presumably rescuing Capt. Nagata and LT Hopper from the water in the process. He and the crew then got to the USS Missouri via 2 RHIBs (Rigid Hull Inflatable Boats). On the deck of the Missouri, he was hopeless about using the ship due to his lack of engineering knowledge on the aging vessel. Eventually, he assisted the veteran engineers of the Missouri in LT Hopper's last stand against the aliens to destroy the NASA Deep Space transmitter. After the final engagement with the aliens, he received an award from Admiral Shane at the awards ceremony.