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In modern military terminology, a frigate is a warship intended to protect other warships and merchant ships as anti-submarine warfare (ASW) combatants for amphibious expeditionary forces, underway replenishment groups, and merchant convoys.

Sailing frigate and its rigging.

During the 18th and early 19th centuries, a frigate was a sailing vessel designed for speed, with a flush gun deck carrying 24 to 44 guns, used as a commerce raider and for blockade duty. With the introduction of steam and steel warships frigates as a class of warship passed out of use until World War II when they were reintroduced by the British as an antisubmarine escort vessel larger than a corvette but smaller than a destroyer.

Frigates of the United States

The oldest commissioned warship in the US Navy is USF Constitution, better known as "Old Ironsides," a frigate put into service in the 1790s. It is the oldest commissioned warship afloat in the world; the HMS Victory, though older, is maintained in drydock.

In the United States Navy, guided missile frigates (with the FFG hull classification symbol) bring an anti-air warfare (AAW) capability to the frigate mission, but they have some limitations. Designed as cost-efficient surface combatants, they lack the multi-mission capability necessary for modern surface combatants faced with multiple, high-technology threats and offer limited capacity for growth.

In an attempt to overcome these limits and provide escorts that could keep up with nuclear-powered aircraft carriers, the US Navy commissioned several nuclear-powered frigates in the 1960s. They were far larger than any other frigates ever seen, and all were reclassified as cruisers in 1975 and struck from the Naval Vessel Register in the 1990s.

The US Navy altered the designation of the DE (destroyer escort) and DEG (destroyer escort with an anti-aircraft missile system) in June, 1975. The new nomenclature was FF (fast frigate) and FFG (fast frigate, guided missile).

The US Navy no longer has any need for single-mission ships and there are no frigates planned for the US Navy's future.

Other links

List of frigates

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