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| | USS S-20 |
 | | In addition to duty in northeastern points out of New London, Connecticut, from 1922 into 1929, the new submarine visited Coco Solo, C.Z., in March 1923; served at St. Thomas, Virgin Islands, in February 1924, and operated in the Panama Canal area from January through April 1926. |
 | | S-20 visited Kingston, Jamaica, from 20 to 28 March 1927, and served again in the Panama Canal area from 17 April 1929 into November 1930. |
 | | Following duty there, she sailed on 20 February 1932 and, from March of that year into April 1933, served at Mare Island. |
| www.navyhistory.com /Submarine/s20.html (287 words) |
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