Serco took delivery of its 27th Damen vessel in the Port of Amsterdam as a three-year contract for 29 vessels nears completion. In 2007, Serco placed the multi-vessel order with the Damen Shipyards Gorinchem to enable the international services to support the British Royal Navy at its bases in Portsmouth, Devonport and the Clyde. The order included pilot boats, supply boats, tugboats, high-speed craft and barges. All of the vessels are specifically built for the naval contract. The very latest delivery, the SD Christina, is the third of four sister ASD tugs.