Who knows if the project is cost effective. Then again, the US likes to splash cash on military projects, so by all means, give it a shot. I can see it being useful for fixed structures too.
IED detection would be the big step forward. Something like an xray, but i think there would be health issues with that.
Fox news is really starting to piss me off, just like Sky News here in UK. Contradictory comments and their excitement over this is so fucking unprofessional.