The fourth USS Decatur (DD-936) was a Forrest Sherman-class destroyer of the United States Navy in service from 1956 to 1983. She was named for Commodore Stephen Decatur USN (1779–1820). Decatur was modernised as a guided missile destroyer in the mid-1960s and re-designated DDG-31. After her decommissioning in 1983, she operated as the U.S. Navy's Self Defense Test Ship from 1994 to 2003. She was finally sunk as a target the following year.

USS Paul F. Foster (DD-964), named for Vice Admiral Paul F. Foster USN (1889–1972), is a Spruance-class destroyer built by the Ingalls Shipbuilding Division of Litton Industries at Pascagoula, Mississippi. She was commissioned on 21 February 1976 and decommissioned on 27 March 2003. She is now ex-Paul F. Foster, serving as a Self Defense Test Ship for experimental U.S. Navy weapons and sensors. She is the last Spruance-class destroyer still afloat.