The USS San Diego (CL-21) was a light cruiser of the United States Navy, commissioned in 1941. She was part of the Brooklyn-class and played a significant role during World War II, participating in various naval battles in the Pacific Theater. The ship was known for her speed and agility, making her effective in both offensive and defensive operations. Throughout her service, the USS San Diego earned multiple battle stars for her contributions to the war effort. After the war, she was decommissioned in 1946 and later sold for scrap in 1970, marking the end of her naval career.