Remember Arnold Schwarzenegger blasting away with the M202 quad rocket launcher in the 1985 classic “Commando”? That’s the flamethrower image etched in our minds—think heavy fuel tank, a hose, and a jittery operator torching a nearby jungle patch. But by the late ’60s, this setup was old news: risky, clunky, and too short-ranged for the bunkers, trenches, and tree lines U.S. troops faced in Vietnam. Time for an upgrade, don’t you think?