The Register 
Thursday, April 2, 2009
Pentagon bizarro-tech chiefs have issued a requirement for mysterious sensor systems which would be able to peer through concrete walls to produce a complete internal picture of a building. US Forces would use such kit for “overseas urban building interior awareness”.
The new plans are known as “Comprehensive Interior Reconnaissance”, and come – of course – from famed off-the-wall military tech bureau DARPA, where they believe it’s better to invent a head-mounted multispectral imaging device than curse the darkness. The Pentagon brainiacs note:
As overseas military and peace-keeping operations have expanded in urban environments, our adversaries have adopted asymmetric strategies such as hiding in and operating out of civilian buildings … it is imperative that we develop technologies to allow US Forces to confidently manoeuvre within urban interiors whether above or below ground …
Once specific buildings have been identified as deserving closer scrutiny, our forces [will] concentrate specific resources on these buildings to support tactical planning. Deployed sensors can spend more time providing detailed situational awareness of a single building, determining its floor plan, underground extent, and underground ingress and egress …Additional sensors can be carried by blue forces as they enter the structure to verify or refine the interior situational awareness and improve our forces manoeuverability.
Specifically, the war-nerds think that operational systems would be deployed in vehicles and aircraft, or perhaps placed near a building of interest by US personnel. The latter static jobs should be no bigger than backpack sized, and “compatible with clandestine operations”.