- 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-21 (Aramis) (former yacht, ID # 418)
- YX-23 (Vamarie) (ketch-rigged yacht, later IX-47, q.v.)
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