CC-5666 was a clone commander who fought during the Clone Wars. 5666 was at some point designated the nickname Concord by his Mandalorian instructor. Later, after completing the training program, Concord was assigned the position of commanding the 123rd clone trooper platoon. Concord's first mission with the 123rd was a reconnaissance mission which included spying on a Confederacy of Independent Systems fortification on Mygeeto.