HMAS Cessnock approaches Darwin Naval Base with a 42 metre-long decommissioning banner flying from it's mast on its final voyage. HMAS Cessnock approaches Darwin Naval Base with a 42 metre-long decommissioning banner flying from it's mast on its final voyage May 11, 2005. The Cessnock is the first of fifteen Fremantle class patrol boats to be decommissioned after 22 years service, and are being replaced over the next two years by the bigger and faster Armidale class patrol boats. REUTERS/David Gray