The Clone Youth Brigade was a brigade within the Grand Army of the Republic that was made up of young clone cadets training to become clone troopers. At one point, an outfit of the Youth Brigade was sent to tour the Venator-class Star Destroyer Endurance, when it was infiltrated by the bounty hunter and clone Boba Fett. Fett sought to exact revenge on Jedi Master Mace Windu, who had killed his father Jango Fett, the genetic template for all clones. Joining a squad of clones including Whiplash, Jax, Hotshot, 1151, and others, Boba Fett succeeded in sabotaging the ship and caused the Endurance to crash on Vanqor.