Noah Schactman on the cycles of innovation and counter-innovation between insurgent-placed IEDs and coalition forces, in Danger Room:

Radio-controlled bombs used to be the biggest killer of American troops in Iraq. Now, they’ve been rendered all-but-useless. Good news, right? Like so much else in Iraq, it’s not quite that simple.

Since the Iraq insurgency began, mobile phones, garage-door openers, and remotely-driven kids’ toys have all been used to trigger improvised explosive devices from afar. In response, the U.S. military has cobbled together an arsenal of radio-frequency jammers, to interrupt the deadly signals before they can set off the bombs. At first, the jammers had all kinds of troubles. Each type of jammer would only cover a relatively small slice of the spectrum. And they’d drive friendly radio and robots haywire.

But those problems have largely been fixed, troops across Iraq report.  The newer jammers have effectively killed off radio-controlled IEDs in major chunks of the country.

The explosive cat-and-mouse game continues, though. The American have built up high-tech bomb-stoppers. So the insurgents have gone ever lower-tech than before. They’ve largely turned towards so-called “command wire” IEDs to attack U.S. targets.

Pairs of insulated copper threads, some not much thicker than a hair, are buried under the Iraqi dust, and strung out for as long as a kilometer. At the end, an insurgent triggerman waits – sometimes in a buried bunker. It’s a more crude approach to killing, of course.  But, barring a lucky find of wires, “there’s no way for us to defeat it,” says one bomb technician.  And those wires are getting attached to bigger and bigger bombs.

[picture above, of a  cement-mixer-turned-shaped-charge. From Danger Room]

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Do away with one problem, and you now have to cope with the blowback from your success.
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Anyway, command-wire bombs aren’t the only IED threat over here. “Pressure plate” weapons, triggered by the smallest stress, are also in vogue here. Some are even shoved into brown ration packets, and left by the side of the road. Insurgents continue to use passive infrared sensors — like those used in burglar alarms – to sense changes in heat, and trigger a bomb accordingly. Many Humvees here are equipped with a flash-type device that can prematurely set the trigger off. But there will surely be a counter to our countermeasure.

Schachtman is on the money. The relative positions of the two forces don’t appear to make it likely that either side will have a distinct advantage with any longevity.

There is one way to deal with a problem of this sort: it’s to make a majority of the local population identify with soldiers, make them believe that the soldiers are acting out of a desire to protect them. That delicate opportunity slipped out of our hand in 2003, and it’s been moving away from us since.