RC-1135, nicknamed Jay, was a male clone of the Mandalorian bounty hunter Jango Fett. Born on the planet Kamino, Jay was created by Kaminoan cloners for use in the Grand Army of the Galactic Republic. Trained as a clone commando, he was a member of Theta Squad, and spent his entire life alongside his squad mates Darman, Vin and their sergeant, Taler. The squad was deployed on the planet Geonosis during the first battle of the Clone Wars and fought alongside Delta Squad, another commando unit, against the forces of the Confederacy of Independent Systems. While fighting in a series of caverns under the planet's surface, Theta provided covering fire for Delta as they progressed through a breached blast door. Geonosian warriors then overwhelmed Jay, Vin and Taler; however, and killed them, lea