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and missions can be identified by the first number on the ship's three-digit hull number, which is placed on the front bows and the back of the stern. The naming convention is:
* Hull number beginning with 1 (reserved for aircraft carriers): ancient empires and kingdoms
* Hull number beginning with 2 (cruisers and destroyers): Indonesia's main islands
* Hull number beginning with 3 (frigates, ocean escorts, corvettes): national heroes
* Hull number beginning with 4 (submarines, submarine

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