VU-4

VU-4, also known as Utility Squadron FOUR, was a United States Navy utility squadron established to provide a variety of support services, including target towing, radar tracking, and drone operations for fleet training exercises. Activated during World War II, VU-4 played a crucial role in enhancing naval aviation readiness along the U.S. East Coast. The squadron operated a range of aircraft, such as the JD-1 Invader and the JD-1D Drone Director, adapting to evolving technological requirements throughout its service. VU-4 was eventually disestablished as advances in technology and changes in training needs rendered its functions obsolete.