They were special forces of the Galactic Republic created to deal with various threats from the Sith Empire following the Great Galactic War.
During the Great Galactic War, Republic troopers were deployed throughout the conflict against the Sith Empire, which had returned from its long periods of exile. These soldiers fought in engagements such as the Battle of Bothawui, where a detachment served under Jedi Master Belth Allusis, who died heroically against the Sith onslaught. Their deaths inspired the Galactic Republic, which had previously been fighting a losing war, and gave it hope due to the heavy losses it inflicted on the Imperial Army.
In past millennia, the Jedi Order had participated in the defense of the Republic alongside regular military units. Over the generations, the Republic military had cooperated in military operations and strategy with Jedi. However, following the upsurge of anti-Jedi sentiment following the Sacking of Coruscant, the Jedi had withdrawn to Tython, leading to decreased Jedi presence within the Republic. Such developments led to the increased deployment of regular Republic forces in defending the remaining Republic territories.
They saw extensive service during the Cold War and the following Galactic War and were often deployed in small units to the most dangerous battle zones. Whether operating solo or in groups, the trooper could still be a terrifying opponent to the enemies of the Republic. Such was their reputation that they generated fear even among Sith combatants.
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