Since the early 1970’s, as the premier Large Surface Combatant shipyard, HII has built and delivered four different classes of destroyers: thirty-one Spruance-Class (DD 963), four Kidd-Class (DDG 993), nineteen Ticonderoga-Class (CG 47) and more than thirty-five Arleigh Burke-Class (DDG 51). Ingalls is currently building Flight III enhanced Arleigh Burke Guided Missile Destroyers. Additionally, Ingalls will be completing modernization work on all three Zumwalt-class destroyers.