That's not quite the whole story of the hollow handle knife. I believe Marble's held a Patent on the hollow handle knife back during World War Two or slightly before it. I'd have to look it up. It was a Matchsafe which should come as no surprise because Marble's also had a Patented matchsafe as well.
I don't know what a Special Forces Medic coming up with the idea to put Codeine, Amphetamines and some other things in there during the Vietnam War has to do with "combat loses in the 70s," I guess you're referring to Uncle Walter's pre-70 brainfart about Tet.
I guess #2 is about First Blood but #3 is interesting. Some people in the cutlery business did go a bit fruity when it came to the "survival knives" of the 1980s but hardly any of the people that were doing this were actually manufacturing them, they were importing them. Some of the imports were really great, primarily from Spain, a couple of them were so-so from Japan and the rest of them were horrendous that gave all of them a bad name...