Antisubmarine warfare in the context of "Torpedo"

Ascension Island is an isolated volcanic island, 7°56′ south of the Equator in the South Atlantic Ocean. It is about 960 miles (1,540 km) from the coast of Africa and 1,400 miles (2,300 km) from the coast of South America. It is governed as part of the British Overseas Territory of Saint Helena, Ascension and Tristan da Cunha, of which the main island, Saint Helena, is around 800 miles (1,300 km) to the southeast. The territory also includes the sparsely populated Tristan da Cunha archipelago, 2,000 miles (3,200 km) to the south, about halfway to the Antarctic Circle.

Ascension Island was possibly discovered by the Portuguese seafarer João da Nova in 1501, before being named Ascension by Afonso de Albuquerque in 1503 on Ascension Day. Ascension Island was garrisoned by the British Admiralty from 22 October 1815 to 1922 and was an important refuelling stop for ships and commercial airliners in the days of international air travel by flying boats. During World War II, it was an important naval and air station, especially providing antisubmarine warfare bases in the Battle of the Atlantic.

Submarine detection systems are an aspect of antisubmarine warfare. They are of particular importance in nuclear deterrence, as they directly undermine one of the three arms of the nuclear triad by making counter-force attacks on submarines possible.

USS Arkansas (CGN-41) was a Virginia-class nuclear-propelled guided-missile cruiser of the U.S. Navy. She was in commission (in active service) from October 1980 through July 1998. Her primary missions were in defending aircraft carrier task forces in air defense (AAW) and antisubmarine warfare (ASW) by using her guided missiles, radar systems, and sonar systems.

For her short-range self-defense, especially for defense against enemy anti-ship missiles, Arkansas carried two automated Phalanx radar-directed 20 millimeters (0.79 in) rapid-fire guns. Also, her two 5-inch rapid-fire naval guns had some capability for anti-aircraft defense.

The Arleigh Burke class of guided-missile destroyers (DDGs) is a United States Navy class of destroyers centered around the Aegis Combat System and the SPY-1D multifunction passive electronically scanned array radar. The class is named after Arleigh Burke, an American destroyer admiral in World War II and later Chief of Naval Operations. With an overall length of 505 to 509.5 feet (153.9 to 155.3 m), displacement ranging from 8,300 to 9,700 tons, and weaponry including over 90 missiles, the Arleigh Burke-class destroyers are larger and more heavily armed than many previous classes of guided-missile cruisers.

These warships are multimission destroyers able to conduct antiaircraft warfare with Aegis and surface-to-air missiles; tactical land strikes with Tomahawk missiles; antisubmarine warfare (ASW) with towed array sonar, antisubmarine rockets, and ASW helicopters; and antisurface warfare (ASuW) with ship-to-ship missiles and guns. With upgrades to their AN/SPY-1 radar systems and their associated missile payloads as part of the Aegis Ballistic Missile Defense System, as well as the introduction of the AN/SPY-6 radar system, the class has also evolved capability as mobile antiballistic missile and antisatellite platforms.