New Republic

"The New Republic. Essentially, a bunch of people got fed up with the way things were going on Chorus, so they put together a rebel army and decided to fight for their freedom. It's all very patriotic."

- Felix in FAQ

The New Republic is a faction in Red vs. Blue consisting of a group of rebels currently fighting against the Empire for control over the planet Chorus. They sent Felix to go rescue the Reds and Blues, who they believe are the greatest military soldiers in the galaxy and can help them win the Civil War.

Overview
According to Felix, an affiliate of the New Republic, after the Great War between the humans and the aliens came to a close, the outer colony of Chorus was forgotten by the UNSC and left to fend for themselves. After a while, the citizens of the planet attempted to govern themselves, but a tyrannical faction known as the Empire attempted to take over the entire planet and put everyone under their supervision. Several rebels, fed up with the Empire, decided to fight for their freedom which began the inception of the New Republic. As a result, this led to a Civil War on Chorus.

Trivia

 * The New Republic and Project Freelancer both have ties to the UNSC. The former was deserted by the military group, while the latter was originally created to be a splinter group.
 * 'New Republic' might be a pun of the Old Republic, a famous faction in the Star Wars franchise.
 * In FAQ, Felix states two other soldiers were sent with him to rescue the Reds and Blues, but they were killed before reaching the canyon.