Sith Trooper

Sith troopers were the foot soldiers of the Sith Empire during the Jedi Civil War. Former Republic forces in the beginning, later free people who followed Revan. Sith troopers were also the primary infantry units for the Sith Triumvirate during the Dark Wars. Sith troopers would once again become a primary infantry force for the Sith Empire three-hundred years later during the time of the Great Galactic War and the Cold War. The faceless and inhuman design of the Sith trooper armor they wore as well as their aggressive combat tactics gave a sense of fear that would often demoralize enemy forces into surrender.

Jedi Civil War
The majority of Sith troopers of Darth Revan's returning armada were traitorous members of the Republic Army, who would later be joined by idealistic volunteers from conquered planets. The weak would be siphoned out through the merciless Sith training schemes, resulting in an efficient and powerful fighting force. The fear present in each trooper not only spurred them on in battle, but also prevented them from turning traitor for a second time.

Some Sith troopers used the fear they imposed in people and the influence they gained from the suit for their own gain, threatening people and intimidating citizens into giving them what they wanted. Others, however, saw themselves as simply doing their job, or believed that the Sith would be better at ruling the galaxy.[1] Following the Jedi Civil War, many of the then demoralized Sith troopers came under the command of the newly formed Sith Triumvirate ruled by Darth Traya, Darth Nihilus, and Darth Sion. At that time, they participated in the Second Battle of Onderon and the Battle of Telos IV.

Sith troopers were often seen as expendable by their superiors, much like battle droids. For example, when Darth Malak was warned by Saul Karath that bombing the planet of Taris in order to kill Bastila Shan would result in the deaths of thousands of the Sith's own soldiers, he merely warned Karath against the perils of questioning his orders.

Great Galactic War
Three-hundred years after the end of the Jedi Civil War and the Dark Wars, the new Sith Empire once more recruited Sith troopers for use in its army during the Great Galactic War. These soldiers participated in the Sacking of Coruscant on behalf of their Sith masters which forced the signing of the Treaty of Coruscant. At the time, they were also involved in the invasion of the Jedi Temple where they accompanied a strike force of elite Sith Warriors that were lead by Darth Malgus, the strike force penetrated the Jedi Temple, where they massacred the occupants within. After storming the capital of Coruscant, the Sith troopers retreated back to their empire leading to a Cold War between them and the Republic.