3rd Radio Research Unit Mobile Det Viet Merch

The 3rd RRU was located at Tan Son Nhut Airbase. ASA personnel of the 3rd Radio Researchd Unit were among the earliest U.S. military advisors in Vietnam; 3rd RRU later grew to become the 509th Radio Research Group.

The 3rd RRU was located at Tan Son Nhut Airbase in RSVN. Republic of South Vietnam.

The 3rd RRU was located at Tan Son Nhut Airbase.ASA personnel of the 3rd Radio Researchd Unit were among the earliest U.S. military advisors in Vietnam; 3rd RRU later grew to become the 509th Radio Research Group.