Attached to Submarine Division1, R-21 operated out of the submarine base at New London, Connecticut. She conducted diving and approach tactical training in Long Island Sound, and conducted several training cruises in the vicinity of Block Island with other units of the division. Following a recruiting cruise to New Haven, Connecticut, and Bridgeport, Rhode Island, from 20 August to 27 August, she returned to New London for upkeep.
Following several practice dives out of Coco Solo, she transited the Panama Canal on 27 January 1920 for drydock work at Balboa. Returning to Coco Solo, R-21 continued to refine her diving, approach, and torpedo tactics through the spring and summer. During two trips to Almirante Bay, 30 March-2 April and 17–20 May, she practiced with other units of the first division.
R-21 under construction, 15 July 1918.
Given hull classification symbol SS-98 in July, R-21 again transited the canal to Balboa 27 September for a month in drydock. Upon returning to Coco Solo, she was laid up for 11 months of extensive overhaul. She sailed north on 26 September 1921 via Guantanamo Bay, Key West, and New York City, arriving New London on 27 October. She sailed to Portsmouth, New Hampshire, on 27 December for refitting.
A successful test dive on 26 May 1922 meant that R-21 could return to New London. Through the spring and summer months she operated out of New London and Newport.
The craft of Submarine Division1 sailed from New 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, Quail(AM-15), and eight other submarines. Two days later R-21's 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.
USS R-12 (SS-89) was an R-class coastal and harbor defense submarine of the United States Navy.
USS Bass (SF-5/SS-164), a Barracuda-class submarine and one of the "V-boats", was the first ship of the United States Navy to be named for the bass.
USS Spikefish (SS/AGSS-404), a Balao-class submarine, was a ship of the United States Navy, named for the spikefish. She was the first United States submarine to record 10,000 dives.
USS S-50 (SS-161) was a fourth-group (S-48) S-class submarine of the United States Navy.
USS S-48 (SS-159) was the first submarine in the fourth group of S-class submarines of the United States Navy.
USS S-14 (SS-119) was a second-group S-class submarine of the United States Navy. Her keel was laid down on 7 December 1917 by the Lake Torpedo Boat Company in Bridgeport, Connecticut. She was launched on 22 October 1919 sponsored by Mrs. George T. Parker, and commissioned on 11 February 1921 with Lieutenant Commander Charles A. Lockwood, Jr., in command.
USS S-15 (SS-120) was a second-group S-class submarine of the United States Navy. Her keel was laid down on 13 December 1917 by the Lake Torpedo Boat Company in Bridgeport, Connecticut. She was launched on 8 March 1920 sponsored by Mrs. Simon Lake, and commissioned on 15 January 1921.
USS S-17 (SS-122) was a second-group S-class submarine of the United States Navy.
USS R-1 (SS-78) was the lead ship of the R-class coastal and harbor defense submarines of the United States Navy.
USS R-23 (SS-99) was an R-class coastal and harbor defense submarine built for the United States Navy during World War I.
USS R-23 (SS-100) was an R-class coastal and harbor defense submarine built for the United States Navy during World War I.
USS R-24 (SS-101) was an R-class coastal and harbor defense submarine built for the United States Navy during World War I.
USS R-26 (SS-103) was an R-class coastal and harbor defense submarine built for the United States Navy during World War I.
USS R-25 (SS-102) was an R-class coastal and harbor defense submarine built for the United States Navy during World War I.
USS R-27 (SS-104) was an R-class coastal and harbor defense submarine built for the United States Navy during World War I.
USS O-13 (SS-74) was an O-class submarine of the United States Navy. Her keel was laid down on 6 March 1916 by the Lake Torpedo Boat Company in Bridgeport, Connecticut.
USS O-16 (SS-77) was one of 16 O-class submarines built for the United States Navy during World War I.
USS N-4 (SS-56) was a N-class coastal defense submarine of the United States Navy. Her keel was laid down on 24 March 1915 by Lake Torpedo Boat Company in Bridgeport, Connecticut. The N-boats built by Lake had slightly different specifications from the ones built by Seattle Construction and Drydock and are sometimes considered a separate class.
USS N-6 (SS-58) was a N-class coastal defense submarine of the United States Navy. Her keel was laid down on 15 April 1915 by Lake Torpedo Boat Company in Bridgeport, Connecticut. The N-boats built by Lake had slightly different specifications from the ones built by Seattle Construction and Drydock and are sometimes considered a separate class.
USS G-2 (SS-27) was a G-class submarine of the United States Navy. While the four G-boats were nominally all of a class, they differed enough in significant details that they are sometimes considered to be four unique boats, each in a class by herself. G-2 was named Tuna when her keel was laid down on 20 October 1909 by the Lake Torpedo Boat Company in Bridgeport, Connecticut, making her the first ship of the United States Navy to be named for the tuna, a large, vigorous, spiny-finned fish highly esteemed for sport and food. She was renamed G-2 on 17 November 1911, launched on 10 January 1912 sponsored by Ms. Marjorie F. Miller, towed to the New York Navy Yard after the termination of the Lake contract on 7 November 1913 where she was completed, and commissioned on 1 December 1913.
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