Soldiers barking orders at each other is so 20th Century. That's why the U.S. Army has just awarded a $4 million contract to begin developing thought helmets" that would harness silent brain waves for secure communication among troops. Ultimately, the Army hopes the project will "lead to direct mental control of military systems by thought alone." Improvements in computing power and a better understanding of how the brain works have scientists busy hunting for the distinctive neural fingerprints that flash through a brain when a person is talking to himself. The Army's initial goal is to capture those brain waves with incredibly sophisticated software that then translates the waves into audible radio messages for other troops in the field. It's not as far-fetched as you might think: video gamers are eagerly awaiting a crude commercial version of brain wave technology - a $299 headset from San Francisco-based Emotiv Systems - in summer 2009. The military's vastly more sophisticated system may be a decade or two away from reality, let alone implementation. The five-year contract it awarded last month to a coalition of scientists from the University of California at Irvine, Carnegie Mellon University, and the University of Maryland, seeks to "decode the activity in brain networks" so that a soldier could radio commands to one or many comrades by thinking of the message he wanted to relay and who should get it.