At the ceremony in Den Helder, the Navy hoisted the so-called war pennant on board HNLMS Den Helder. With this, HNLMS Den Helder is now formally recognisable as a warship that Defence can deploy for national and allied defence. HNLMS Den Helder before commissioning (photo by Dutch Ministry of Defence). As a supply ship, HNLMS Den Helder provides other vessels at sea with fuel, ammunition, food, and spare parts. In the background, HNLMS Den Helder (photo by Dutch Ministry of Defence).