Although Schley and two sisters authorized in 1915—USS T-2 SS-60 (originally AA-2), and USS T-3 SS-61 (originally AA-3)—all made their design speed of 20 knots , insoluble torsional vibration problems with their tandem engines made them very troublesome ships, and they were decommissioned in 1922-1923 after a service life of only a few years.