Domenico Marquez pilots the Jotunheim, a civilian space cargo vessel retrofitted under the Principality of Zeon’s command during the One Year War. Tasked with the 603rd Technical Evaluation Unit, he navigates the ship through high-stakes experimental weapon trials targeting Earth Federation Forces. The Jotunheim’s missions deploy cutting-edge prototypes like the aquatic MSM-07Di Ze’Gok, the mobile ballistic MP-02A Oggo, and the heavy-assault MA-05Ad Big Rang during the events of *Apocalypse 0079*. Earlier assignments in *The Hidden One Year War* saw Domenico supporting tests of the EMS-10 Zudah’s experimental thrusters and the QCX-76A Jormungand’s artillery systems. His documented service remains exclusively tied to these operations across the *MS IGLOO* OVA series, executing tactical maneuvers and combat evaluations without deviation.