- YX-7 (Boxer) (training brig, described under AG)
- YX-8 (C.T.B. No. 6, ex Morris) (former torpedo boat)
- YX-10 (Favorite) (salvage tug, WWI ID # 1385, later IX-45, q.v.)
- YX-11 (Grampus) (freight/passenger steamer, ID # 1708)
- YX-12 (Hermes) (auxiliary schooner, WWI prize)
- YX-13 (Herreshoff No. 308) (steam yacht, ID # 2232)
- YX-14 (Nahant) (tug, ex Luckenbach No. 4, ID # 1250)
- YX-18 (Traffic) (freight steamer, acquired circa 1894)
- YX-19 (Transfer) (freight steamer, later IX-46, q.v.)
- YX-20 (Goliah) (tug, ID # 1494)
- YX-21 (Cuyahoga) (ex-Coast Guard cutter, later AG-26, q.v.)
- YX-23 (Vamarie) (ketch-rigged yacht, later IX-47, q.v.)
Note: YX was a file symbol in the Navy Filing Manual and was never a hull type designator, the three surviving vessels with YX file symbols being merged into the IX list when IX became a hull type designator in 1941. The remaining units in the YX series included two small motorboats, Ahdeek (YX-5, 36-ft., ex ID # 2589) and Estelle (YX-9, 40-ft, ex ID # 747), a Naval Academy sloop, Robert Center (YX-17, 66-ft., acquired 1895), and a Naval Academy yawl, Argo (YX-6, 57-ft., acquired 1906). The other seven craft with YX file symbols were barges of various types.
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