USNS Mercy cap. The ship was built as an oil tanker, SS Worth, by National Steel and Shipbuilding Company, San Diego, California, in 1976. Starting in July 1984, she was renamed and converted to a hospital ship by the same company. Launched on 20 July 1985, USNS Mercy was commissioned on 8 November 1986. Donor's name and occasion information were not provided to the City Clerk's office.