53305 of April 1, 1921, required only 18 pages to set out the specifications that resulted in the purchase of three DT (D for Douglas, T for torpedo) folding-wing aircraft.

The DT could be fitted either with pontoons or wheeled landing gear and could carry a 1,800 lb (816 kg) torpedo.

The DT operated off the U.S. Navy's first aircraft carrier, USS Langley, from land bases, and from seaplane tenders.

Machines licence-built by Dayton-Wright were internally designated SDW by that company.

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