The SS Jeremiah O'Brien is a World War II-era Liberty ship, notable for its historical significance and impressive preservation. Constructed rapidly at the New England Shipbuilding Corporation in South Portland, Maine, she was launched on June 19, 1943, as an EC2-S-C1 class vessel. The ship measures approximately 441 feet in length with a beam of 57 feet, and her design includes a triple-expansion steam engine, similar to that of the Titanic, which powered her during her wartime service. During the war, Jeremiah O'Brien was deployed in both the European and Pacific Theaters. She participated in the D-Day invasion, serving as part of the Operation Neptune invasion fleet, and made four round-trip convoy crossings of the Atlantic, including 11 cross-channel trips supporting the Normandy landings. Later, she was transferred to the Pacific, where she served for 16 months, calling at various ports including Chile, Peru, New Guinea, the Philippines, India, China, and Australia. Following the war, she was mothballed in the National Defense Reserve Fleet at Suisun Bay for 33 years. In the late 20th century, the vessel was preserved through the efforts of the National Liberty Ship Memorial, becoming the only Liberty Ship to leave the mothball fleet under her own power in 1979. She was restored in San Francisco, where she now functions as a museum ship, offering tours and occasional voyages. She was designated a National Historic Landmark in 1986 and a National Historic Mechanical Engineering Landmark in 1984. The ship famously returned to Normandy in 1994 for the 50th anniversary of D-Day, making her the only large ship from the original invasion fleet to do so. Today, Jeremiah O'Brien is fully restored to her WWII configuration, with most areas accessible to the public, showcasing her historical engines and ship systems. She continues to serve as a symbol of American maritime history and the vital role of the Merchant Marine during wartime.

This description has been generated using GPT-4.1-NANO based on the Vessel's wikidata information and then modified by ShipIndex.org staff.