In 1940, the Todd-Bath Iron Shipbuilding Corp (later called the “East Yard”) was established to build cargo ships for Britain. When the United States became involved with World War II, the shipyard expanded to include the South Portland Shipbuilding Corp. (aka the “West Yard”), that later combined with the Todd-Bath yard to become the New England Shipbuilding Corporation. These shipyards built 236 of the 440 foot (134 m) long Liberty ships, more than 10 percent of all the Liberty ships constructed during the war years. At its peak, the shipyard employed some 30,000 people, including thousands of women, who took over the jobs vacated by men going into the service. The shipyard gradually ceased operations after the war ended in 1945. Remnants of the shipyards are visible, and there is a memorial to the shipyard and the workers at Bug Light Park. The park is also home to Portland Breakwater Lighthouse, commonly referred to as "Bug Light."