ARC-77, known as "Fordo," was an Advanced Recon Commando captain in the Grand Army of the Republic. In 22 BBY, he was assigned to a task force led by the Jedi Knight General Obi-Wan Kenobi, to take the Confederate-held world of Muunilinst. Together with a group of clone troopers that would later come to be known as The Muunilinst 10, Fordo proved instrumental in the Battle of Muunilinst, leading his troops to destroy an enemy artillery emplacement, and then helping Kenobi capture the enemy leader, San Hill.
Immediately after the battle was over, Fordo was dispatched to the planet Hypori, where a group of Jedi Knights had been trapped by the Confederate General Grievous. Making their way to the Jedi's location, Fordo and his men battled Grievous, but were unable to kill him. They were, however, able to recover three survivors: Ki-Adi-Mundi, Aayla Secura, and Shaak Ti. In 19 BBY, Fordo was on Coruscant when it was attacked by the Confederacy. Defending the Sector Four district, Fordo was hard pressed to beat back the attackers, and he realised that his position was being overrun. Calling for reinforcements, he took his DC-15A blaster rifle and used it to smack down an approaching B2 super battle droid. Drawing his pistol and picking up a fallen comrade's DC-15A, Fordo continued to hold his ground, but eventually gave the order to retreat.
At that moment, Jedi Master Yoda arrived astride a kybuck, and countermanded the Captain's earlier order. Shortly afterward, General Mace Windu arrived astride a commandeered vulture droid. The battle continued on, and Fordo's men gained the advantage, allowing the Captain to have his right flank advance into the enemy lines. He did not have to worry about his left flank, however, as that was being watched over by Windu and Yoda. The Republic ended up winning the Battle of Coruscant. It is unknown if he joined the Empire after the Clone Wars Ended.