However , throughout the period of 1912 - 1939 , the development of the Navy 's F , H , and S class boats was marred by a series of accidents , collisions , and sinkings .
As American technology expanded , the U.S. submarine fleet grew rapidly .
Throughout the period of 1912 - 1939 , the development of the Navy 's F , H , and S class boats was marred by a series of accidents , collisions , and sinkings .
As American technology expanded , the U.S. submarine fleet grew rapidly .