SS Charles H. Cugle was a Type Z-EC2-S-C5 Liberty ship built by J.A. Jones Construction of Panama City, Florida, launched on 13 August 1945. It was ordered by the War Shipping Administration under Maritime Commission Contract number 3145. As part of the Army Nuclear Power Program the ship was transferred to the U.S. Army in March 1963, and fitted with a pressurized water reactor, fuelled by used low enriched uranium, designed by Martin Marietta, becoming the world's first floating nuclear power plant, at a cost of $17 million.