USS Guardian may refer to the following ships of the United States Navy: , launched as the Liberty ship SS James G. Squires in 1945; placed in reserve at the end of World War II, converted to a radar picket ship and recommissioned as USS Guardian in 1955, decommissioned in 1965, and scrapped in 1971 , a PT boat under the Potomac River Naval Command; named USS Guardian in November 1959 (official designation remained PT-809) , an that was launched in 1987, commissioned in 1989, and grounded on a reef and decommissioned in 2013. United States Navy ship names