HS-75

Helicopter Anti-Submarine Squadron 75 (HS-75), known as the "Emerald Knights," was a United States Navy Reserve squadron established in 1970. Based at Naval Air Station Willow Grove, Pennsylvania, the squadron operated the Sikorsky SH-3 Sea King helicopter, focusing on anti-submarine warfare, search and rescue, and utility missions. HS-75 regularly participated in fleet exercises and supported operational deployments, contributing to both peacetime training and operational readiness during the Cold War. The squadron was disestablished in 2007 as part of the Navy’s reorganization and transition to newer aircraft and mission profiles.