An interesting idea.
But carpet bombing is much more effective.
The US Defense Advanced Research Project Agency (DARPA) reports that field trials of a new threat detection system, which augments cameras with a human operator's brainwaves, has shown remarkable success in spotting potential threats. DARPAs been working on the snappily titled Cognitive Technology Threat Warning System (CT2WS …
Clearly they will have to surgically remove the operator's brain and eyes and put the stuff into a hermetically sealed live support box ("brain-with-eyes in a box"). The brain-with-eyes is then flashed images captured by a camera, brainwaves are read and a audible alarm will go off if something of interest is detected.
Frontline personnel can then carry the box on missions and scan the environment with it (like in Aliens), mount it onto armored vehicles or on the axis of a machine gun etc...
There doesn't seem to be many "threats" leaving impression on the visual fields in Afghanistan. We read:
"There were so many IEDs you had to watch every step and literally walk in the footprints of the guy in front of you. The Marines were leaving trails of bottle tops or sweets to mark cleared paths. I didn’t see a bullet fired in anger, it was just IEDs. Marines love to fight, but no one wants to go out on eight-hour patrols every day, through ice cold mud, when nothing ever happens apart from occasionally seeing one of their buddies get blown up."