The Special Boat Service (SBS) is the special forces unit of the British Naval Service. Their motto is "By Strength and Guile". It forms part of the United Kingdom Special Forces (UKSF) group. The SBS is an independent unit of the Royal Marines based at Royal Marines Poole, in Poole, Dorset, co-located with 1 Assault Group Royal Marines and 148 Commando Forward Observation Battery, Royal Artillery. Image:Stub.png. You can help My English Wiki by expanding it.