The Belknap-class cruiser was a class of single-ended guided-missile cruisers (their missile armament was installed only forward, unlike "double-ended" missile cruisers with missile armament installed both forward and aft) built for the United States Navy during the 1960s. They were originally designated as DLG frigates (destroyer leaders; the USN use of the term frigate from 1950 to 1975 was intended to evoke the power of the sailing frigates of old),[citation needed] but in the 1975 fleet realignment, they were reclassified as guided missile cruisers (CG).
When commissioned, the main armament of the Belknap class was a 5-inch/54-caliber Mk. 42 gun on the quarterdeck and a twin-rail RIM-2 Terrier Mk 10 Missile Launcher on the foredeck.[6] The Mk 10 Mod 7 launchers in this class were also capable of launching RUR-5 ASROC to eliminate need for a separate Mk 112 ASROC launcher.[7] These were unofficially spoken of as Ter/AS (tear-ass) launchers.[citation needed] The class was also equipped with two twin 3"/50 caliber guns for defence against sub-sonic aircraft.[2] In the early 1980s, the Terrier missiles were replaced with RIM-67 Standard missiles; and during the NTU program in the late 1980s and early 1990s the class had its Standard SM-1 system upgraded to utilize SM-2ER Block II, the 3-inch guns were replaced with two 4 cell Harpoon Surface-to-surface missile launchers, and two Phalanx CIWS systems were installed.[2]
The derivative USS Truxtun shared the weapons systems outfit of the Belknap class, but was nuclear-powered, larger and substantially unrelated in design (for example, many weapons systems in different locations, such as the aft-facing GMLS). Most information related to nuclear cruisers is still classified, but Truxtun appears to be more a Belknap-like derivative of the nuclear cruiser Bainbridge than the other way around.[6]
38°04′52″N 122°05′19″W / 38.0812°N 122.0885°W / 38.0812; -122.0885