 For the remainder of 1913 , Yorktown conducted local operations out of San Diego and San Francisco . In January 1914 , though , the gunboat returned to Mexican waters and investigated local conditions at Ensenada between 3 and 6 January before moving , in subsequent months , to a succession of Mexican ports : Mazatlán , San Blas , Miramar , Topolobampo , and La Paz . Following an overhaul at Mare Island from 24 June to 2 September 1914 , Yorktown served in Mexican waters again into June 1915 . From that point until the entry of the United States into World War I in April 1917 , Yorktown continued her routine of patrols off Mexican , Nicaraguan , and Honduran ports with occasional repairs at Mare Island and maneuvers out of San Diego . 
