The Arleigh Burke class of guided missile destroyers, one of the destroyer classes of the United States Navy, is built around the Aegis combat system and the SPY-1D multi-function phased array radar. The first ship was commissioned on 4 July 1991. With the decommissioning of the last Spruance-class destroyer, USS Cushing, on September 21, 2005, the Arleigh Burke class ships are the U.S. Navy's only active destroyers.