Wanna keep G.I.s from shooting each other by mistake? Then pay up.The Army is thinking about equipping its tanks and other armored vehicles with the Battlefield Targeting Identification Device. The shoebox-sized gizmo lets a shooter ask his target whether it's a friend or a foe, and enables the target to answer back instantly.But fixing the gadget onto the Army's fleet of tanks and Humvees? That'll cost $7 billion, according to Defense News. And that only protects the vehicles. It doesn't even begin to solve the problem of individual soldiers getting shot by their mates. That's how football player-turned-Ranger Cpl. Pat Tillman likely was killed on duty in Afghanistan.
