6,500 personnel - about 20% of the Naval Service on duty or deployed this Christmas. Think of them! Units include: An SSN and an SSBN (underwater) HMS Diamond (Red Sea) HMS Lancaster HMS Chiddingfold, Middleton and Bangor and RFA Cardigan Bay (Bahrain) RFA Lyme Bay and RFA Argus (Eastern Med) HMS Tamar (South Pacific), HMS Spey (Singapore), HMS Trent (Barbados), HMS Forth (Falklands) and HMS Medway (Gibraltar) HMS Protector (Antarctica) HMS Scott (North Atlantic)