A three-year, 29-vessel contract came to an end as the last tugboat of the huge Serco contract was named SD Deborah at the Damen headquarters in Gorinchem on 3 December 2010. Due to be deployed at Devenport, one of the main bases of the British Royal Navy, the SD Deborah was the smallest ASD tug in the order, which has included pilot boats, tugboats, high-speed craft, barges and a worldwide support vessel. SD Deborah is one of four sister tugs. The 16 Damen vessel types included in the order ranged between 39.3 ft and 282 ft.