Helicopters make a distinctive sound. It’s sort of a whop-whop noise, and it differs a little from one chopper model to the next. The Vietnam War was the first true helicopter war. Early on, our primary troop carrier was the CH-34. We also had an observation outfit flying the UH-1Es (a variant of the legendary “Huey”).
When he made the point, my buddy was speaking from a position of strength. Chuck Karwan—West Point graduate, champion heavyweight wrestler, combat platoon leader, Green Beret, outdoorsman, gunwriter—was a bear of a guy. He had an encyclopedic knowledge of firearms of all sorts. Karwan was particularly fond of digging into the development of handguns; sights, systems, breeching, etc.; from Paterson to present.