There's a big difference between a thing being developed and the Pentegon actually getting their hands on it. What DARPA is developing is a way to improve/utilize existing technology in a way that could benefit soldiers at some level, which is pretty cool - but in all honesty it has to go through pretty significant hoops before the military (Army, Navy, etc) ever actually get it.
At least for the Army, getting any new products through the Acquisitions bureaucracy can take many years, and as is the case with a lot of communications equipment things can be dangerously obsolete by the time we get them.
That's why Futures Command is being stood up. Yay futures!