Career Update: S1 to S26
The S class were planned just as the United States were entering war in April 1917, seeing what was needed in the rapidly developing context of unrestricted German submarine warfare. This was the third of three mass-produced sub-classes, but the S class mass massive: 65 ordered, 51 completed, most well after WWI (the last in 1925), and most saw action in WW2, many as training boats as the war progressed in 1941 to train captains and officers of the mass-built Gato/Tench/Balao classes, arguably their world war two counterparts. Many saw active service in Royal Navy hands (A dozen transferred under lend lease) even the Polish Navy, and the remainder served actively, multiplying patrols in the Western Atlantic due to their limited range. Nine were lost.
Construction was divided among shipbuilders, and despite the design was standardized, this ended with many sub-classes.