U.S. unprepared for 4th gen warfare.

Unless the Defense Department gets serious about training for "4th generation warfare, U.S. troops will find it tough to outsmart enemies, said a counterterrorism expert.

In 4th generation warfare, where the other side refuses to stand up and fight fair, U.S. troops must learn how to

think like the enemy, said Kelly McCann, who runs private security operations for corporate clients. The defense industry also needs to get the message that high-tech is not always better. "The interface between the person and the equipment has got to be dumbed down, made super-simple," said McCann. Fighting in the city, soldiers can't see the horizon and can't see out of an armored Humvee.

Unmanned aircraft are great, but they are not quick enough, he said. "The kid in the Humvee is going 45 miles an hour, people are shooting at him. He doesn't have time to wait for the video to go back to the intelligence link, to the company commander and back. He'll be ambushed by then ... That's the reality of being in a city: being totally disoriented when the rockets start flying."