This stuff already exists, and I'm sure it's being trained with.
The Kiowa warrior helicopters that my workplace puts the electronics on is outfitted with a cool lil ball above the rotors. It has many diff forms of cameras/surveilance tools so that it can peek it's head up over the tree line and scan the area.
Heat signatures are mapped against gps coords for all the friendly units wearing the gear, and this data is passed(encrypted) to the other armour units nearby. These units then relay that data (via encrpted wireless protocols) to the HUD displays on each soldiers headgear. From here, the information relayed from the vehicles is overlayed with video/IR referencing, identifying friend and foe (and other pertinent info) in the battlefield.
Granted, this all relies on a whole lot of gear working, but redundancy is built into the systems, and the data transmission is very versatile. Each "node" can act as both a reciever and a repeater, enlarging the effective area as units disperse (to an extent).
so, long story short, it's real, and almost in use...