http://news.yahoo.com/s/time/20080915/us_time/thearmystotallyseriousmindcontrolproject;_ylt=AmZQks.b2NQe64RukZ2ZTfes0NUE

The gist of the story is that the army has a way that is a small technological jump from radios that will allow soldiers in the field and pretty much anywhere communicate via thought. The key is that they already have a device that can read thought waves and it is just a matter of isolating their own thoughts and identifying which brain waves are the thought patterns used when talking to yourself.