Croatian Navy joins NATO's Operation Sea Guardian for the first time Tuesday, 4 September 2018 Army, Defence, Military, News, World A Croatian navy missile boat left a port in Split on the Adriatic Sea on Monday to join NATO's Operation Sea Guardian in the Mediterranean, state news agency HINA reported. Read more Croatian Navy's ROTP-41 (ex Helsinki-class) missile boat "Vukovar" leaving Split (Credit: MORH/T. Brandt) Read more Tweet Subscribe to receive free email updates: