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The 4th Naval Warfare Flotilla (Swedish: Fjärde sjöstridsflottiljen or 4. sjöstridsflj) is one of three flotillas in the Swedish Navy and is a part of the Berga Naval Base. The unit is based at Berga south of the Swedish capital Stockholm. It was formed in 2005 when the former naval mine warfare flotilla was split and surface warfare units was edit.