Four-One, a clone trooper lieutenant, served within the ranks of the Grand Army of the Republic throughout the Clone Wars. During the Battle of Haruun Kal, he took to the skies as a pilot of a LAAT/i gunship. Serving under him were 2nd Lieutenant CL-33/890, along with Auxiliary Heavy-Weapons Specialists Seven-Four, and Eight-Three.
The gunship he piloted was assigned to the medium cruiser known as the Halleck. Despite suffering significant damage during the Haruun Kal engagement, the ship remained operational and played a crucial role in rescuing stranded clones following the battle.