SASless...
A peculiarily American view; must be a tradition of the Royal's Senior Service, like Rum, Buggah and the Lash. Read Tom Clancy's book on Subs...good discussion on the Perisher course. RN very tactically-oriented Captains, US (due to one Admiral Rickover) very nuclear-engineering oriented officers and, hence, Captains. Our guys won't accidently blow themselves up; RN guys will let engineers worry about the boat whilst blowing the enemy.
The RN is ONLY service in the world to use a nuclear sub in anger...successfully!!!
GF
Two classes of ships.....Subs and Targets