United States S-class submarine

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The United States' S-class submarines, often simply called S-boats (sometimes "Sugar" boats, after the contemporary Navy phonetic alphabet for "S"), were the first class of submarines with a significant number built to United States Navy designs. They made up the bulk of the USN submarine service in the interwar years and could be found in almost every theater of operations. While not considered fleet submarines, they were the first submarines in the USN designed for open ocean, blue water operations. All previous submarines had been intended for harbor or coastal defense. These boats were intended to have greater speed and range than previous classes, with improved habitability and greater armament. The S-class were designed during World War I, but not completed until after the war. Many boats of the class remained in service through World War II. The United States Navy commissioned 51 S-class submarines from 1920 to 1925. The first boat in name sequence, USS S-1 (SS-105), was commissioned...

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