UNSC Mother of Invention (FFG-636) was a Remembrance-class frigate in service with the United Nations Space Command Navy during the Human-Covenant War. Mother of Invention was commissioned in April 2519, and was stationed in the Sol system for much of her early operational service, accounting for her long service. Mother of Invention primarily operated long range patrols around Sol, policing the system against criminal and insurrectionist activity, and finally saw combat against the Covenant in late 2552. In that year, she fought at the Battle of Earth, where she survived the destruction of the UNSC Home Fleet, and became one of the UNSC's few operational vessels left in the system. From 2553, Mother of Invention served in the Remnant War, participating in Operation: REAR GUARD, the UNSC's