I'm quite interested into looking at the various aspects of the Vietnam War, not that I loved it or hated it; I just enjoy watching what happened in this era.
On the following movie, around time 05 mn 30 s, several cameras can be observed. 2 of them are Nikonos 3 hanging from the neck of one of the soldier.
There is another one just before that action, can't tell what type though.
I've watched carefully and there are cameras at the following times:
2:11, 2:39, 4:03, 4:09, 4:30, 5:30, 7:15, 7:25