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The United States Navy reclassified many of its surface vessels in 1975, changing terminology and hull classification symbols for aircraft carriers, cruisers, frigates, and ocean escorts.

From the 1950s to 1975, the Navy had three types of fast task force escorts and one type of convoy escort. The task force escorts were cruisers (CL/CLG/CG), frigates or destroyer-leaders (DL/DLG), and destroyers (DD/DDG); the convoy escorts were ocean escorts (DE/DEG), often known as destroyer escorts. Added in the early 1970s was a new ocean escort called the patrol frigate (PF). In 1975, these classifications were simplified to cruiser (CG), destroyer (DD/DDG), and frigate (FF/FFG).

Under the pre-1975 classification, cruisers were large vessels, the size of World War II gun cruisers, intended as the primary surface combatants. All but one (USS Long Beach (CGN-9)) were converted WWII gun cruisers (CL/CLG or CA/CAG). They were to carry the long-range Talos missile, and, in many cases, strategic weapons such as Regulus or Polaris (but these were not fitted). One cruiser was to be assigned to each carrier group. There were relatively few of these ships, due to their cost and because the frigates could carry almost as many weapons as a cruiser.

From 1950 to 1975, frigates were a new type, midway between cruiser and destroyer sizes, intended as major task force escorts. The first ship of the type was a redesignated ASW cruiser; the next four were very large AAW (gun) destroyers, and the remainder were essentially oversize guided missile destroyers. They carried the mid-range Terrier missile, but no offensive (strategic) weapons.

Destroyers were developed from the WWII designs as the smallest fast task force escorts. DDs were fast ASW ships; DDGs were AAW ships carrying the short-range Tartar missile.

Ocean escorts were an evolution of the WWII destroyer escort types. They were intended as convoy escorts and were designed for mobilization production in wartime or low-cost mass production in peacetime. DEs were ASW vessels; DEGs were AAW vessels with the Tartar.

The U.S. frigate classification was not used by any other navy; similar vessels were either cruisers or destroyers in foreign service. The ocean escort type corresponded to foreign frigates (convoy escorts).

The Soviets defined "cruiser" differently, considering ships equivalent to U.S. frigates to be "cruisers." By 1974, there were only six ships in U.S. service classified as cruisers, but the Soviets had 19 ships classified as cruisers in service with seven more building. (All totals exclude gun-only cruisers.) All but two of the Soviet ships were relatively small vessels, roughly equivalent to U.S. frigates and far smaller than U.S. cruisers.

The differing U.S. and Soviet definitions of "cruiser" caused political problems when comparisons were made between U.S. and Soviet naval forces. A table comparing U.S. and Soviet cruiser forces showed six U.S. ships vs. 19 Soviet ships, despite the existence of 21 U.S. "frigates" equal or superior to the Soviet "cruisers." This led to the perception of a non-existent "cruiser gap."

To close this "gap," the U.S. frigate (DL/DLG) classification was eliminated on 30 June 1975. All the gun frigates (DL) had already been stricken. Most of the DLGs became cruisers (CG), but the smaller Farraguts became destroyers (DDG). The change from DLG to CG redefined "cruiser" as smaller ships, more like large destroyers. Cruiser classifications were also simplified, with the guided missile light cruisers (CLG) simply becoming CGs. Gun cruisers were provided the designation "CA" at this time, but there were no remaining gun cruisers in active service with the fleet, so the designation was and remains theoretical.

The ocean escorts (DE/DEG) and patrol frigates (PF) became frigates (FF/FFG).

Finally, the attack carriers (CVA/CVAN) became multimission carriers (CV/CVN). These changes brought U.S. Navy classifications into line with foreign classifications, and eliminated the perceived "cruiser gap."

A final change came on 1 January 1980, when the Ticonderoga-class destroyers (DDG) became cruisers (CG).

• sci.military.naval FAQ, Part F Surface Combatants, Section F.8 - reprinted with permission