War brings out the very best in technological innovation. Humans have shown themselves to be remarkably adept in devising new, creative ways to kill each other. The Vietnam War brought out this human capacity for creative destruction on a grand scale, even if it manifested itself a little differently on both sides.
The United States was blasting into the Space Age and, with that surge of technology, came chemical defoliants, like Agent Orange and jet aircraft that could break the sound barrier. The Vietnamese expanded their work on tried-and-true effective yet obsolete weapons, like punji stick booby traps. The two sides were worlds apart technologically, but when it came to murderous creativity, the combatants were close peers.
1. People sniffers
The XM-2 backpack mounted personnel detector.
The United States was desperately seeking a way to detect North Vietnamese Army and Viet Cong movement across the DMZ and down the Ho Chi Minh trail, not to mention the bands of NVA and VC that were hiding in the dense jungles of South Vietnam. The U.S. infamously used the chemical defoliant Agent Orange to strip vegetation from entire areas, but it was more effective at giving everyone cancer than it was at outing hidden bands of the enemy.
So, the minds over at General Electric created a mobile cloud chamber that could detect ammonia, a component of human sweat. They called them the XM2 and XM3 personnel detectors, but the troops who used the devices quickly dubbed them "people sniffers." While troops hated the XM2 backpack versions (and for good reasons, like the noise it made in an ambush area and the fact that it detected their sweat as well as the enemy's), the XM3 saw widespread use on helicopters.
However, the enemy caught on and began to post buckets of urine around the jungle to create decoys for people sniffers. In the end, the device wasn't even that great at picking up people, but it did detect recent cooking fires, which retained its usefulness.
Gross dog poop. ...or is it?
It's fairly well-known by now that the punji stick booby traps used by the Viet Cong during the were sometimes smeared with poop as a means to cause a bacterial infection in the victim. The idea was to try to take as many people and resources from the battlefield as possible: one injured soldier, at least one more to help cart him away, and maybe a helicopter could be lured into an ambush trying to medevac the wounded.
What's not as well known is the Americans also used poop to their advantage. This is, again, the result of trying to track the movement of men and materiel down the Ho Chi Minh Trail. The United States placed sensors along the supposed routes of the Trail but when discovered, these sensors were, of course, destroyed. The U.S. needed to place sensors that wouldn't be detected or destroyed. The answer was poop – in the form of a poop-shaped radio beacon.
An X-ray view of that same "poop."
The Air Force dropped these sensors from the air and they would detect movement along the trail during the night, relaying the signal via radio. Since they looked like disgusting poop, the VC and NVA would often just leave them alone, thus ensuring the Americans would be able to listen along the trail.
3. "Lazy Dog" Flechettes
Imagine an explosive device filled with thousands of tiny darts or nails. It's not difficult – many anti-personnel weapons use some kind of shrapnel or fragmentation to wreak havoc on enemy formations. Flechette weapons in the Vietnam War were no different. American helicopters, ground forces, and even bombers would fire missiles and rockets filled with thousands of these darts, launched at high speeds to turn any enemy cluster into swiss cheese.
A unique version of the flechette weapons however, came from B-52 Bombers, who would fly so high as to be pretty much silent to enemy Viet Cong or North Vietnam Army formations on the ground. When dropped from such a high altitude, the darts didn't need an explosive to propel them, as they fell to Earth, they gained in velocity what they would have had from such an explosion. The result was a deadly blast of thousands of darts that was both invisible and inaudible – until it was too late and death rained from the sky.
Fun fact: When dropped from space, a large enough object could hit the ground with the force of a nuclear weapon.
4. Tactical Tree Crusher
Throughout the war, the Army wrestled with the problem of clearing vegetation to find Vietnamese hiding spots. Since Agent Orange took too long and could be washed away by heavy rains, the U.S. needed another way to clear paths for the troops. In 1968, they leased two vehicles designed for logging companies and sent them off to Southeast Asia. These became tactical tree crushers.
A 60-ton vehicle with multi-bladed logger wheels knocked trees over and chopped the logs as it drove. The U.S. military version would have a .50-cal mounted on the rear for self-defense, as well as a couple of claymores on the sides to keep the VC away from the driver. The vehicle was very effective at clearing trees, but the engine was prone to giving out and the large design made it an easy target for the enemy, so the military version was never made.
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