World War I era acquired vessels numbered from SP-400 through
SP-499:
- ID # 400: Walter
Adams. 271 gross ton fishing vessel, 1890. USN: Walter
Adams, 1918-1919
- SP-402: Vidofner. 27 gross ton motor boat,
1906. USN: Vidofner, 1917-1917
- SP-403: Helen Euphane. 178 gross ton fishing
vessel, 1902. USN: Helen Euphane, 1917-1919. No image
available
- SP-406: Vigilant. 30 gross ton motor boat,
1916. USN: Vigilant (renamed SP-406, 1918), 1917-1918
- SP-407: Speedway. 15 gross ton motor boat.
USN: Speedway, 1917-1919
- SP-408: Artmar
III. 63-foot motor boat, 1912. USN: Artmar III,
1917-1919
- SP-409: Patrol
# 2. 40-foot motor boat, circa 1915-1916. USN: Patrol
# 2, 1917-1919
- SP-411: Susanne. 40 gross ton motor boat, 1916.
USN: Susanne (renamed SP-411, 1918), 1917-1919.
No image available
- SP-413: Marija. Motor boat. USN: Marija,
1917-1922. No image available
- SP-415: Kemah. 300 gross ton motor yacht, 1917.
USN: Kemah, 1918-1920
- SP-416: B.H.B.
Hubbard. 400-ton fishing vessel, 1911. USN: B.H.B.
Hubbard (also known as Hubbard), 1917-1919
- SP-417: Eclipse. 84-foot auxiliary schooner, 1906. USN: Eclipse, 1917-1919
- SP-418: Aramis.
375-ton motor yacht, 1916. USN: Aramis (later redesignated
PY-7), 1917-1933
- SP-423: Gretchen. 84 gross ton motor boat.
USN: Gretchen, 1917-1917
- SP-424: Nemes.
50-foot motor boat, 1909. USN: Nemes, 1917-1917
- SP-425: Minerva.
80-foot motor boat, 1914. USN: Minerva, 1917-1919
- SP-426: Sequoyah. 15 gross ton fishing boat,
1905. USN: Sequoyah (renamed SP-426, 1918), 1917-1919.
No image available
- SP-427: Seneca. 157 gross ton steam yacht, 1888. USN: Seneca (renamed SP-427, 1918), 1917-1919
- SP-428: Mystery.
71-foot motor boat, 1917. USN: Mystery, 1917-1919
- SP-429: W.T.
James. 267 gross ton fishing vessel, 1912. USN: W.T.
James (also known as James), 1917-1919
- SP-430: Gypsum Queen. 361 gross ton tug, 1890.
USN: Gypsum Queen, 1917-1919
- SP-431: Venetia. 589 gross ton steam yacht, 1904. USN: Venetia, 1917-1919
- SP-432: Oneida.
552 gross ton steam yacht, 1897. No U.S. Navy service
- SP-436: Gaivota. 74 gross ton steam boat. USN:
Gaivota, 1917-1918. No image available
- SP-437: Greyhound. Motor boat, 1916. USN: Greyhound,
1917-1919
- SP-438: Jesamine.
90' 3" motor boat, 1907. USN: Jesamine (renamed SP-438
in 1918), 1917-1919
- SP-439: Kanised.
100-foot motor boat, 1909. Also named Tuscanola and Nahemoka.
USN: Kanised, 1917-1919
- SP-444: Beaumere
II. 62.5-foot motor boat, 1914. Also named Madge II.
USN: Beaumere II, 1917-1919
- SP-448: Wendy. 55-foot motor boat, 1913. USN: Wendy, 1917-1918
- SP-450: Weepoose. 60-foot motor boat, 1911. USN: Weepoose, 1917-1920
- SP-451: Audwin.
60-foot motor boat, 1911. USN: Audwin, 1917-1919
- SP-453: Ameera.
71¼-foot motor boat, 1917. USN: Ameera, 1917-1920
- SP-455: Anado.
70-foot motor boat, 1917. USN: Anado, 1917-1919
- ID # 458: Luckenbach Number 2. 273 gross ton tug, 1891. Originally named Edgar F. Luckenbach. USN: Cherokee, 1917-1918
- SP-459: Genevieve. 95-ton fishing vessel, 1895.
USN: Genevieve, 1918-1919
- SP-460: Aurore
II. 96-foot motor boat, 1916. USN: Aurore II (renamed
SP-460 in 1918), 1917-1919
- SP-462: Mary.
57' 6" motor boat, 1907 (or 1908). Also named Dida
and (perhaps) Boston. No U.S. Navy service
- SP-463: Yo Ho. 46' 4" motor boat, 1910. USN: Yo Ho, 1917-1919
- SP-465: Blue
Bird. 72-foot motor boat, 1911. Also named Houqua
and (perhaps) Parthenia. USN: Blue Bird, 1917-1919
- SP-467: Delaware. 242 gross ton fishing vessel,
1913. USN: Delaware (renamed SP-467, 1918. Later
redesignated AT-53 and YT-111), 1917-1935
- SP-469: Tangier. 7 gross ton motor boat. USN:
Tangier, 1917-1918. No image available
- SP-470: Saint
Sebastian. 50-foot motor boat. USN: Saint Sebastian,
1917-1919
- SP-471: Sylvia.
48' 6" motor boat. USN: Sylvia (renamed SP-471
in 1918), 1917-1919
- SP-479: Knickerbocker.
123 gross ton tug, 1873. USN: Knickerbocker, 1917-1919
- SP-484: Babette
II. 52-foot motor boat, 1917. USN: Babette II,
1917-1919
- SP-485: John B. Hinton. 309 gross ton fishing vessel, 1912. USN: John B. Hinton, 1917-1919
- SP-493: Winfield S. Cahill. 299 gross ton fishing vessel, 1912. Later named Eraclea. USN: Winfield S. Cahill, 1917-1919
- SP-495: Courier. 91.3-foot steam yacht,1897. No U.S. Navy service. No image is available, or known to exist
- SP-498: Williams 18. 41 gross ton motor boat,
1907. Also named Grayling. USN: Williams 18 (renamed
SP-498, 1918), 1917-1918. No image available
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