On Kamino, the Alpha-class Advanced Recon Commandos were kept in stasis tubes after being trained by the Mandalorian bounty hunter and prime clone Jango Fett. The Kaminoans were afraid of their unpredictability and thus kept them in stasis. The ARC's were only revived as a last resort when Tipoca City was in danger of being overrun by Confederacy of Independent Systems Battle droids.