USS YP-18 was a wooden-hulled patrol vessel in commission in the fleet of the United States Coast Guard as CG-263 from 1925 to 1934, and in the fleet of the United States Navy as YP-18 from 1934 until 1938.
She was laid down at the Seattle shipyard of the Lake Union Dry Dock and Machine Works, one of 203 "Six-Bitters" ordered by the United States Coast Guard.[1] [2] She was designed for long-range picket and patrol duty during Prohibition for postings 20 to 30 miles from shore.[3] The date of her launching and completion is uncertain although the class design was finalized in April 1924 and all of the Six-Bitters were commissioned by 1925.[3] She was commissioned in 1925 as CG-263.[2] On 21 February 1934, she was transferred to the United States Navy and designated as a Yard Patrol Craft (YP).[2] She was assigned to the 13th Naval District where she trained reservists.[2] She was struck from the Naval List on 25 November 1938.[2]