http://www.washingtontimes.com/national/20050425-122710-9671r.htm
"Rebels improve bomb schemes in Iraq"
By Rowan Scarborough
THE WASHINGTON TIMES
April 25, 2005
ARTICLE SNIPPET: "Iraqi insurgents keep finding new ways to conceal and detonate deadly improvised explosive devices, making the Pentagon's countermeasures that much more difficult to develop, confidential military documents say.
"Enemy sophistication continually improves," said a recent U.S. military briefing to commanders. "The enemy is adapting all the time."
The document said that after the U.S. had success with jamming radio signals between the bomber and the improvised explosive devices (IEDs), insurgents quickly reverted to direct-wire ignition that cannot be jammed."