 The USAF Detachment 2, 6925th Security Group established a signals intelligence (SIGINT) base on the mountain in 1962 to intercept North Vietnamese HF and VHF communications.The USAF 620th Tactical Control Squadron established a Control and Reporting Center (CRC) Call Sign "Panama" on the mountain in 1964 to control fighters operating in I Corps.Most of the fighters came from Da Nang Air Base or Phu Cat Air Base.