Riverbank Army Ammunition Plant was built in 1942 as an aluminum reduction plant operated by Alcoa (the world's eighth-largest producer of aluminum, with corporate headquarters in Pittsburgh, Pennsylvania)  for World War II aircraft manufacture until 1944, then reactivated in 1951 for the Korean War and as the United States' largest producer of steel cartridge cases until 1958.
The facility was built in 1942 as an aluminum reduction plant operated by Alcoa producing 48,000 tons per year for World War II aircraft manufacture until 1944. It is the world's eighth largest producer of aluminum, with corporate headquarters in Pittsburgh, Pennsylvania. It was reactivated in 1951 for the Korean War and was the United States' largest producer of steel cartridge cases until 1958. 
