USC&GS Dailhache was a United States Coast and Geodetic Survey ship in service from 1919 to 1934.

Dailhache was built as the civilian

Civilian

A civilian under international humanitarian law is a person who is not a member of his or her country's armed forces or other militia. Civilians are distinct from combatants. They are afforded a degree of legal protection from the effects of war and military occupation...

 yacht

Yacht

A yacht is a recreational boat or ship. The term originated from the Dutch Jacht meaning "hunt". It was originally defined as a light fast sailing vessel used by the Dutch navy to pursue pirates and other transgressors around and into the shallow waters of the Low Countries...

 Olympic in 1913 by E. W. Heath at Seattle

Seattle, Washington

Seattle is the county seat of King County, Washington. With 608,660 residents as of the 2010 Census, Seattle is the largest city in the Northwestern United States. The Seattle metropolitan area of about 3.4 million inhabitants is the 15th largest metropolitan area in the country...

, Washington. She served in the United States Navy

United States Navy

The United States Navy is the naval warfare service branch of the United States Armed Forces and one of the seven uniformed services of the United States. The U.S. Navy is the largest in the world; its battle fleet tonnage is greater than that of the next 13 largest navies combined. The U.S...

 from 1917 to 1919, operating as the patrol vessel USS Olympic (SP-260)

USS Olympic (SP-260)

USS Olympic was a United States Navy patrol vessel in commission from 1917 to 1919.Olympic was built as a civilian yacht of the same name in 1913 by E. W. Heath at Seattle, Washington. The U.S. Navy acquired her from her owner, Frank Wright of Seattle, on 15 May 1917 for World War I service as a...

 during World War I

World War I

World War I , which was predominantly called the World War or the Great War from its occurrence until 1939, and the First World War or World War I thereafter, was a major war centred in Europe that began on 28 July 1914 and lasted until 11 November 1918...

.

Olympic was transferred to the Coast and Geodetic Survey on 13 September 1919 and renamed Dailhache on 12 November 1919. She served at Seattle with the Survey until sold to H. W. McCurdy on 10 February 1934.