in Pula (including, most notably, the flagship SMS Viribus Unitis) and some in Kotor, but the Entente navies soon captured nearly all vessels and divided them among themselves. Croatian officers and sailors continued to man the new Royal Yugoslav Navy (1918–1941) until its demise during the Axis invasion of Yugoslavia. During World War II Croatian partisans formed a guerilla Partisan Navy consisting of makeshift vessels in 1942, resisting Italian (and later German) occupation of the Adriatic. In the later phases of the war, they cooperated closely with the Royal Navy. After the war, Socialist Yugoslav Navy, sprung up from the partisan navy, had Split as its HQ and mainly used shipyards in Šibenik, Split, Kraljevica, Rijeka and Pula. Modern Croatian Navy In 1991, after the federal Yugoslav armed forces sided with Serbian leadership under Milošević and decided to fight against democratically elected Croatian government which proclaimed Croatia's independence, ethnically Croat naval officers and rank-and-file led by admiral Sveto Letica started forming a new Croatian Navy. Using coastal artillery batteries they forced Yugoslav ships to retreat from Croatian territorial waters while in commando actions Croatian forces and shipyard personnel seized naval equipment and 35 vessels. At least three Yugoslav patrol boats were disabled in action and two minesweepers sunk. The Croatian Navy played an important role during the Croatian War of Independence (1991-1995), especially after acquiring strategically important RBS-15B missiles. After the war In 2004 Croatia joined NATO and the Navy was restructured in the process. In addition to that, in 2007 it was reorganized by dividing the personnel and vessels with newly founded Coast Guard, which remained a part of the Navy. Two former Helsinki class missile boats, FNS Oulu and FNS Kotka, were acquired from Finland. They were renamed Vukovar and Dubrovnik respectively (both cities were almost completely destroyed by Serbian and Montenegro shelling during the Croatian war of independence), and entered service in December, 2008. They were acquired along with a considerable amount of spare parts (most notably three MTU engines - to be installed on Kralj class vessels) due to a severe shortage of vessels at present. The price of these ships was €9 million and is considered rather symbolic, mostly because it was a part of the offset deal for the previous Croatian acquisition of Patria AMV armoured vehicles. The ships reached their full operational capability in June, 2009. The 2015 Strategic Defence Review envisages an