London on 2 October 1922 for Coco Solo. R-21 served as flagship as the boats cruised via Hampton Roads and Guantanamo. After 11 days out, R-24 developed engine trouble and was temporarily taken under tow by R-21. The Cuba-bound steamer SS Bethore rendered assistance, and R-21 arrived at Coco Solo on 27 October. R-21 spent the rest of her active Navy days operating out of Coco Solo and undergoing repairs at Balboa. She sailed from Coco Solo for the last time 15 February 1923 in company with a tender, , and eight other submarines. Two days later R-21s engines malfunctioned and she was towed into Guantanamo by the tender. Repairs were quickly accomplished and R-21 sailed for Philadelphia, Pennsylvania, on 22 February, arriving there via Charleston, South Carolina, on 9 November 1923. Decommissioned at the Philadelphia Navy Yard on 21 June 1924, R-21 was struck from the Naval Vessel Register on 9 May 1930 and sold for scrap 30 July 1930. References External links Ships built in Bridgeport, Connecticut R-21 (SS-98) 1918 ships