Role
After World War II, the main naval threat to most western nations was confrontation with the Soviet Union. The Soviets ended the war with a small navy and took the route of asymmetric confrontation against western surface ship superiority by investing heavily in submarines both for attack and later fielding submarine launched missiles. Several nations who purchased British and US surplus light carriers were most easily able to accommodate slow moving, less expensive, and easy to land anti-submarine aircraft from the 1960s forward such as the S-2 Tracker which flew from the decks of US, Canadian, Australian, Dutch, Argentine, and Brazilian carriers or Alizé which flew from French and Indian ships, allowing these ships to still remain useful especially in the framework of NATO even as newer fighter and strike aircraft were becoming too heavy for the equipment designed for WWII aircraft.
Improvement in long range shore based patrol and conventional ship-based ASW helicopter capability combined with the increasing difficulty maintaining surplus WWII carriers led to most of these ships being retired or docked by smaller nations from the 1970s to the mid-1980s. This trend in ASW force draw down only accelerated with the massive reduction in the operational Soviet/Russian submarine fleet which rarely went to sea in large numbers in the 1990s. Ships that could be called dedicated ASW carriers are now only found with the Japanese navy which operates helicopters and no fixed wing carrier based aircraft of any kind. Even the United States Navy, the last nation to regularly operate a dedicated fixed wing carrier based ASW aircraft, the S-3 Viking, on its mixed role super carriers had already removed most ASW equipment in the 1990s from this aircraft and has now removed this type from service as of January 2009 without replacement. Interestingly, the Argentine Navy, currently without much hope of a replacement CATOBAR carrier of its own, still trains several times a year landing S-2 Turbo Trackers aboard the Brazilian carrier São Paulo.
Much easier to operate from small decks than fixed-wing aircraft were ASW helicopters which flew from the decks of nearly all allied conventional carriers to this day and most LPH or STOVL carriers operated by the Soviet, Spanish, Italian, Japanese, British, and Thai navies. Since the only navy currently building new ASW through-deck helicopter-only ships is Japan, who terms their vessels as helicopter destroyers instead of ASW carriers, it is disputable if an ASW helicopter-only vessel is best defined as an ASW carrier or given a new designation.
Read more about this topic: Anti-submarine Warfare Carrier
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