Defence Minister Richard Marles said the frigates would replace Australia's ANZAC-class ships, the oldest surface combatant fleet the navy has been operating since the end of World War II. "This does represent a very significant moment in the bilateral relationship between Australia and Japan," Mr Marles said. "This is the biggest defence industry agreement that will ever have been struck between Japan and Australia. It's one of the biggest defence exports that Japan has ever engaged in." Mr Marles said the first would come into service by the end of this decade, closing a gap that would have otherwise meant Australia would not receive a new surface combatant until 2034, when the first of the Hunter Class vessels would arrive.