Did US service personal really have the opportunity to phone home from Forward Operating Bases during the Vietnam War, before the days of the mobile phone? It is good if there were facilities in place that enabled this to happen but I am surprised if this was the case.

The reason that I ask the question is that in a documentary on the Vietnam War that I have been following recently, an interview with a US veteran, seem to suggest that he could "phone home" from a F.O.B. in Vietnam. I could, of-course, have miss heard what the veteran said.
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