Ennen served in the squad Galaar during the Clone Wars. Near the end of the war, Ennen and fellow squadmate Bry would be the only remaining members of Galaar. Because of this, the squad was combined with the remaining members of Omega Squad and became Squad 40. The commandos did not get along very well, as Niner and Darman, who were formerly of Omega, were trained by Kal Skirata, a Mandalorian, and Ennen and Bry were trained by a Corellian. Bry and Ennen would argue with Darman, and Niner would have to break up fights.
During their first mission, a Jedi Master named Iri Camas, who had previously directed the commandos, killed Bry and himself. Ennen was furious at the death of Bry. Bry's position would be filled by a new clone known as TK-70558 or Rede, a Centax clone rather than a Kamino clone. Ennen, Darman and Niner were somewhat uncomfortable with Rede, as he was not like them. On their next mission, Ennen would go to kill a civilian who possessed a lightsaber. The civilian stole the lightsaber from a deceased Jedi during Order 66. Ennen would later go on to commit suicide, something that rarely happened to clones.
- Imperial Commando: 501st