[laplata]

I don’t remember hearing about any waterways on the DMZ.

[RoosterRedux]

Ben Hai River.

[Portcall24]

15 months sitting behind a UPA-35 in RVN and I never saw anything that matches any of these stories. I was aware of a radar phenomenon called “ducting” where an object would seem to be closing on your site at a tremendous speed but it was much further away (hundreds of miles sometimes). The radar beam gets trapped in an inversion layer and behaves erratically.

[oh8eleven]

I don’t remember hearing about any waterways on the DMZ.
The Ben Hai River physically separated the north from the south.

In fact, my gun (8" howitzer") blew away the "Peace Bridge" crossing that river in 1967 when the NVA refused to move their artillery out of the area.

[Uncle Lonny]

Me either. But US forces supposedly stayed out of the DMZ because it was the Demilitarized Zone,

But then, maybe we had a PBR that could go on land?