This concrete-and-sand-bag bunker is typical of the fighting positions ringing the fire base. In front of the fighting position is chain-link fence held up with engineer stakes. It was used to detonate rocket-propelled grenades before they hit the bunker. In front of the bunker line was triple-strand concertina razor wire with 55-gal. drums of jellied gasoline called "fougasse." We also placed Claymore antipersonnel mines that could be command-detonated from the bunker. Finally, the defense included a couple of dual-40mm M42 "Dusters" that have one heck of a wallop! I sure wouldn't want to attack a position employing them. . . .