The UNSC Winter Moonlight, hull designation number FFG-777, was a stealth vessel of the Loki-class operating under the United Nations Space Command. Christened from the orbital dry docks of Mars, the Winter Moonlight participated during the majority of the Remnant War; afterward, it would also raise arms against the Necros' invasion. For the majority of the vessel's early service years, it would be a component of Ninth Battlegroup, a provisional unit of twenty-one vessels assigned to patrol the Outer Colonies for hostile activity, though the Battlegroup would soon find itself leading offensives into the shrinking Covenant Remnant territory.