The United Rebel Front were a complex, well-organized faction of Humans devoted to complete liberation from the influence of the Unified Earth Government and the United Nations Space Command. The organization is led by three Generals, one of whom was General Howard Graves before his death in 2531.
By 2531 United Rebel Front had repeatedly had its operations disrupted by a four-man team of SPARTAN-II supersoldiers known as Blue Team. The team disrupted URF operations including Station Jefferson, the destroyer URF Origami and a saboteur cell on Reach, as well as an incident in Micronesia, and a high-explosives manufacturing facility at an unspecified location. In response the rebels gathered together three stolen FENRIS Nuclear Warheads at Camp New Hope in a way so sloppy that the Office of Naval Intelligence could not help but notice, then contacted the UNSC CENTCOM and offered to trade the nukes in exchange for medicines for their people suffering from Boren's Syndrome, all the while setting a trap for Blue Team, whom they anticipated would be sent. During the Raid on Camp New Hope the rebels successfully ambushed John-117, Frederic-104, Kelly-087 and Linda-058 using an antigravity plate, they were however unaware of the presence of a fifth Spartan and new addition to the team, Kurt-051, who had avoided the trap. Kurt was able to free the other members of Blue Team. They then retreated from the camp with the recovered warheads before the camp could launch a proper counterattack. General Howard Graves was killed in the process.
The rebels also had a number of arms, ranging from military-grade MAKO Drones and FENRIS Nuclear Warheads to Archer Missiles and .30 cal "Confetti Maker" machine guns. Some "old technology that never panned out" also found their way into the URF's hands; such technology included an Antigravity plate to fool the Spartan's armor systems into thinking they were in a 10 G environment, temporarily giving them decompression sickness, otherwise known as "the bends."
The URF also used Parabola-class Freighters such as the Laden, to ferry and ship diverse equipment, resources, and weapons from planet systems to their base; they also somehow managed to acquire the destroyer, Origami.
The United Rebel Front had a highly organized intelligence division, and a far flung network of facilities, comprised of a network of different rebel movements, such as the Eridanus Rebels.
They commanded facilities such as Eridanus secundus, Camp New Hope on planet Victoria and Station Jefferson, which was located in the asteroid belt of Eridanus. They also had a high explosives manufacturing facility, operations of an unknown kind on Micronesia, and a saboteur cell on Reach. All these operations were eventually shut down by the Spartans of Blue Team.
The URF has attempted to gain control over many different planets. So far their presence has been noted on a few.
- It has been theorized that the URF is what became of the remnants of the Insurrectionist movement during the Human-Covenant war.
- It has also been theorized that the Rebel bases in Halo Wars belong to the United Rebel Front, as they are on maps that take place on Human-controlled planets like Harvest and Arcadia, or others, such as the planet Fort Deen takes place on.