Harbor Defense Command was a military organization responsible for protecting coastal areas and harbors from potential threats, particularly during wartime. It focused on coordinating various defense measures, including surveillance, naval operations, and the deployment of coastal artillery. The command played a crucial role in ensuring the safety of vital maritime infrastructure. Established during the early 20th century, Harbor Defense Command operated in conjunction with other military branches, such as the U.S. Army and U.S. Navy. Its strategic importance grew during conflicts like World War II, where safeguarding ports and shipping routes became essential for national security and military logistics.