"Regarding friendly fire problems, consider that any device that can be read by us can also be read by the enemy - which means they have perfect little RF homing signals for their outgoing fire."
And since RFID's have to be "painted" with interogation signals in order to be read, we have perfect big RF homing signals for our outgoing.
( but since current RFID's range about 12 ft max right now, we are within "whites of their eyes" range anyway )
>>>Regarding friendly fire problems, consider that any device that can be read by us can also be read by the enemy
...that's why DoD wants em so bad.