USS Alert
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Five ships of the United States Navy have borne the name USS Alert. During World War I, three ships held the name simultaneously.
- The first Alert was a sloop-of-war captured from Britain in the War of 1812.
- The second Alert was a screw tug used in the American Civil War.
- The third Alert (AS-4) was a screw steamer in use during the late 19th century and World War I.
- The fourth Alert was a steam launch acquired from the United States Coast Guard during World War I.
- The fifth Alert (SP-511) was a motorboat used as a patrol boat during World War I.