Lawmakers questioned his military's readiness to detect and counter enemy troops who might use similar blind spots.

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Barbero says technology is only part of the answer: troops have to be trained to get the full value of counter-IED technology, and detailed intelligence is required to attack enemy networks and finances.

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The units, dubbed "Churchill's Secret Army", were set up to relay vital information about enemy movements and help mount counter-attacks as Britain braced itself for occupation.

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U.S. forces are dealing with an adaptive, innovative and flexible enemy, according to the Joint Improvised Explosive Device Defeat Organization, or JIEDDO, which is leading the counter-IED effort for the military.

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