Captain Jacob Keyes (SN: 01928-19912-JK) was a legendary naval officer and one of the most brilliant tacticians in the UNSC Navy. He commanded great respect as a highly skilled strategist and inspirational leader to those under his command. His many decorations, thirty-five years of combat experience against the Covenant, and the ability to keep a secret made him an almost natural choice to command the UNSC Pillar of Autumn and its most secret cargo. He could often be seen chewing the tip of his grandfather's pipe.