As well as project teams the WSA operated the three naval bases in Portsmouth, Plymouth and on the Clyde.
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However, Marine Services was put out to commercial tender by the Ministry of Defence Warship Support Agency (now part of the Defence Equipment and Support organisation) and since 1996 tugs, lifting craft, various tenders and management of HMNB Devonport, Portsmouth and Clyde have been operated and provided by Serco Denholm.