Following the final testing and trials of the YMS-09 Prototype Dom, the standard production type MS-09 immediately began rolling off the Zeonic Corps' assembly lines. Supplanting the recently-produced MS-07B Gouf as the mainstay ground combat unit of Zeon's mobile suit forces, the Dom line's place was assured as a agile, heavy-type mobile suit for the next several years. The first three production Doms were given to Zeon's "Black Trinary" aces and stationed as the frontline defense for M'Quve's Odessa mining base during the One Year War. Though their amazing ground speed and agility gave the crew of the invading Federation carrier White Base a hard time, the Black Trinary was simply outmatched by the emerging Newtype abilities of RX-78-2 Gundam pilot Amuro Ray. Amuro was able to dodge the Black Trinary's infamous coordinated "jetstream" attack - destroying all three of the Doms in the process.