509th RRGP 146th Aviation Company

The **509th Radio Research Group (RRGP) – 146th Aviation Company** was a specialized U.S. Army unit active during the Vietnam War. Tasked with aerial signals intelligence (SIGINT) operations, the 146th Aviation Company operated aircraft such as the RU-6A and RU-8D to intercept enemy communications. As part of the 509th RRGP, their missions provided critical real-time intelligence to ground forces, supporting both tactical operations and strategic planning. The unit’s skilled aircrews and analysts played a vital role in counterinsurgency efforts throughout Southeast Asia until the drawdown of U.S. forces in the early 1970s.