"On This Date in History" Calendar
1973: 509th Radio Research Group was resubordinated.
![](https://cdn.firespring.com/images/e0d8f9e8-406f-483e-a8f3-34de15972c27.jpg)
7 March 1973: The 509th Radio Research Group was resubordinated, ending ASA's 12-year presence in South Vietnam.
"On This Date in History" Calendar
7 March 1973: The 509th Radio Research Group was resubordinated, ending ASA's 12-year presence in South Vietnam.