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Fremantle-class patrol boat
The ''Fremantle''-class patrol boats were coastal patrol vessels operated by the Royal Australian Navy (RAN) from 1979 to 2007. Designed by British shipbuilder Brooke Marine and constructed in Australia by North Queensland Engineers and Agents, the ''Fremantle'' class were larger, more powerful, and more capable than the preceding ''Attack'' class, and the two primary patrol boat bases required infrastructure upgrades to support them. Although up to 30 vessels were planned, fifteen were ordered and constructed, with an unexercised option for five more.
Their retirement was announced in 2001 and a decommissioning schedule published in 2004. From May 2005 they were replaced by the ''Armidale''-class patrol boats with the last two ''Fremantle''s decommissioning in May 2007. Most of the class were scrapped, with two marked for preservation as museum ships. The ''Fremantle'' class has also appeared in two drama television series based on the Royal Australian Navy.
==Planning and development==
The concept for the ''Fremantle'' class began somewhere between 1967 and 1969, as the ''Attack''-class patrol boats entered service, and areas for improvement were observed.〔''Semaphore 17'', 2005, para. 2〕 In September 1970, the RAN announced the intention to construct ten new patrol boats, which would operate in tandem with the ''Attack'' class and replace two general purpose vessels.〔 These new vessels were intended to enter service between 1976 and 1980.〔 The number of vessels to be built fluctuated, peaking at thirty vessels (16 RAN, 4 Royal Australian Naval Reserve, and 10 for the military of Papua New Guinea),〔 and settling at fifteen.〔''Semaphore 17'', 2005, para. 3〕
Plans of acquisition were announced in April 1975, with eleven shipbuilders submitting tenders, of which two were shortlisted in 1976; Brooke Marine of the United Kingdom and Lürssen Werft of Germany.〔 Brooke Marine won the contract to design and produce the lead ship, with North Queensland Engineers and Agents contracted to build the other fourteen vessels.〔 An option for an additional five vessels existed, but they were placed on indefinite hold in 1982.〔〔 There was a separate acquisition plan for six missile-armed variants, but this was suspended due to the lack of available funding, and the belief that such ships could be constructed on short notice if required.〔
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