Burning Ground: Sentinels
Sentinels are Mercenaries who are deserters of former Terran Confederacy.
They were back then the most important of Confederacy and elite marine unit and they also participated at the Guild War.
As Zerg and Protoss destroyed Mar Sara and Chau Sara, they were engaged to defend but were heavily defeated and retreated to Tarsonis.
However, as Psi Emitter was installed on the planet and as Zerg assaulted to Tarsonis, they decided to desert because of their hopeless situation.
Afterward, as the Confederacy fell, they has grown up to mercenaries and was about to join the Terran Dominion, they decided to remain as mercenaries because it was better for them to be mercenaries or to raid than the little payment of Dominion.
They customized their old CMC armor powerfully that the movement speed was increased. In addition, they are armed with powerful shotgun, special riot shield and special sensor so that they are very much powerful.
On the battlefield, they work as a powerful fire team.