The Spruance-class destroyer was developed to replace a large number of World War II-built Allen M. Sumner- and Gearing-class destroyers, and was the primary destroyer built for the U.S. Navy during the 1970s.
Ironically enough, the DDG-1000 Zumwalt classdestroyers are to be built around the 6.1" advanced gun system and thus properly deserving of the unmodified DD hull classification symbol.
The entire class of 30 ships was contracted on June 23, 1970 to the Litton-Ingalls shipyard in Pascagoula, Mississippi, under the Total Package Procurement concept forced on the Navy by the Whiz Kids of Robert McNamara's Pentagon.