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The Georges Leygues
class (Type F70) is a class of anti-submarine frigate
A frigate is any of several types of warship, the term having been used for ships of various sizes and roles over the last few centuries.In the 17th century, the term was used for any warship built for speed and maneuverability, the description often used being "frigate-built"...
s of the French Navy
The French Navy, officially the Marine nationale and often called La Royale is the maritime arm of the French military. It includes a full range of fighting vessels, from patrol boats to a nuclear powered aircraft carrier and 10 nuclear-powered submarines, four of which are capable of launching...
. They are polyvalent (multi-role), due to their Exocet
The Exocet is a French-built anti-ship missile whose various versions can be launched from surface vessels, submarines, helicopters and fixed wing aircraft. Hundreds were fired in combat during the 1980s.-Etymology:...
and Crotale missile
The Crotale EDIR is an all-weather short-range anti-air missile, which can be used to intercept low-flight anti-ship missiles and aircraft...
complement, making them especially suitable for defence of strategic positions, demonstrations, or highseas escorts.
A superstructure is an upward extension of an existing structure above a baseline. This term is applied to various kinds of physical structures such as buildings, bridges, or ships...
s were built as to optimise resistance against nuclear explosion blasts.
The F70 is internationally labelled an "anti-submarine destroyer
In naval terminology, a destroyer is a fast and maneuverable yet long-endurance warship intended to escort larger vessels in a fleet, convoy or battle group and defend them against smaller, powerful, short-range attackers. Destroyers, originally called torpedo-boat destroyers in 1892, evolved from...
" (hence the "D" in the hull numbers), though the French don't use the term and refer to the ships as "frigates".
The last three ships of the class had their bridges raised one deck to overcome problems experienced by the first four in bad weather, as well as being equipped with DSBV 61 passive linear towed array sonar
Sonar is a technique that uses sound propagation to navigate, communicate with or detect other vessels...
and several other upgraded systems.