Somewhat akin to the Squadrons of the Terran Confederacy, the DMC appears to function somewhat independently from the space-based Dominion Armada, its officers having control over their own ships. Its logo is referred to as the "Golden Eagle", and the bald eagle has also been used in DMC heraldry. This symbol is a variant of the Alpha Squadron insignia.
After the Brood War, the corps carried out tasks ranging from delivering supplies to patrolling colonies for potential enemies. A DMC force was responsible for the depopulation of Candore Colony, which had been harboring a group of insurgents. It also engaged the protoss and zerg on Artika.
Elements of the Dominion Marine Corps are also present at Mar Sara, acting as security for the Kel-Morian Combine mining camps as well as fighting the zerg who invaded the planet at the same time.
By 2503, the Corps had once again become a viable force, performing services throughout the Dominion. This included countering the insurgency of Project Shadowblade.
In 2504, with the onset of the Second Great War, the marines helped hold the line against the zerg. Eventually, alongside the Dominion Fleet, the Corps partook in an invasion of Char. Despite taking heavy casualties, the Dominion emerged victorious in the end. However, Kerrigan survived, and after a brief civil war between loyalists to Valerian Mengsk and Arcturus Mengsk the Dominion Marine Corps raided Umoja, capturing Jim Raynor. Kerrigan returned with the Zerg Swarm, repelling he Dominion Marine Corps from Char, rescuing Jim Raynor, and destroying the Dominion's hybrid operations. The best of the Dominion Marine Corps defended Korhal as the zerg invaded, but they were defeated, and Arcturus Mengsk was killed. In his place, his son, Valerian Mengsk, took over the Dominion.
In 2506, the End War began. While some marines fell to the control of hybrids and joined Moebius Corps, others came to its defense when the forces of Amon sought to destroy the Dominion. They participated in the defense of Korhal, and were aided by the Daelaam protoss. Together, the two forces pushed Moebius Corps and their hybrid masters off the planet, and retrieved the Keystone from them. However, the cost was high, and many marines lay dead in the aftermath. The Dominion Marine Corps then took up defense against the corrupted Golden Armada, but were pushed back.
Years later, the Dominion Marine Corps affirmed their support of the new regime under Valerian Mengsk, who publically instituted new reforms for the organization such as the abolishment of the neural resocialization program.
"Each and every one of these young men and women volunteered. And after months of sacrifice and toil in training, they have earned their place among the noble Dominion Marines. They have joined humanity's vanguard. They have chosen to stand against an unforgiving universe."
↑Arcturus Mengsk: "I called in a few favors. Made a few concessions. You'd be surprised to see how many special interest groups in this sector want to see you dead." StarCraft: Brood War. Vivendi Games. Level/area: Omega (in English). 1998