The two groups were Called FOB 1 and FOB 2
I think it really stood for Foward Operating Base
If I remember right Kontum was FOB 2 and Long Viea or Keason (not sure of the spellings) was FOB 1, In 1967 we ( the 119/52nd) were flying the missions out of Kham Duc which was overrun in late 67 prior to the Tet of 68. When I was at Hue in 1969 and 70 I heard it referred to as CCN1 and CCN2 (Command and Control North. In any case it was a wierd Mission.
BT