AOCS (Air Operations Communications
System) was the HF system the RAAF used after 1973, taking over from the area
guard HF system that had been used since WWII. There were four Air Operations
Communications Centres that comprised the AOCS, these were located at
Townsville, Darwin, Pearce and Glenbrook. Many hundreds of operators and
technicians spent hour upon hour on operating and keeping the system going.
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