Inshore Undersea Warfare Group One

Inshore Undersea Warfare Group One (IUWG-1) was a United States Navy unit established during the Cold War era to provide harbor defense and security in U.S. and allied ports. The unit specialized in inshore and nearshore undersea warfare, focusing on the detection and deterrence of enemy submarines and underwater threats, such as mines and sabotage divers. IUWG-1 operated a variety of sensors, patrol craft, and surveillance equipment, and was composed primarily of Navy Reserve personnel trained for rapid deployment. The group played a critical role in ensuring the safety of naval bases and harbors, particularly during heightened periods of tension, before being disestablished in the early 2000s as part of a Navy reorganization.