Jonesy

Jonesy was a calico cat carried on the UNSC Pillar of Autumn. It was a pet of someone onboard the Autumn and was onboard during the Battle of Reach and when the Autumn reached Installation 04. However, Jonesy's owner had lost him by then, although he put notices on the Bulletin Board to alert other personnel to the lost cat. Jonesy died during the Battle of Installation 04 either during the Covenant boarding, when the Autumn crashed, or when John-117 and Cortana initiated a meltdown that destroyed all of Installation 04.

Jonesy is an obvious reference to the calico cat Jonesy from the first two Alien films.