Captain Jacob Keyes was placed in command. Prior to the Fall of Reach, Pillar of Autumn was selected to support Operation: RED FLAG, a SPARTAN-II operation to capture Covenant leaders. It was informally referred to as the Autumn, and its name abbreviated to 'PoA.' The motto for the ship was Ad Arcendam Hostium UNSC Pillar of Autumn ( HCS: C-709) was a Halcyon-class light cruiser in the UNSC Navy. Thel 'Vadamee explaining the Battle of Installation 04 to the High Council.