Hum. Was wondering if you can get hit by frendly fire? Ie can one of your own team hit an damage you tank?
A pill box would be intersting. Instead of firing in one direction like a tank a multi IR Led array would fire like a fan spray. Or a directional sound detector could zero in like radar on the noize made by the tank.
Hum a smart bomb.... Or how about something much much much bigger. Get a high output IR lamp and modulate with the "IR" bullet signal. As the German would say a eargespliter!
Basicaly frys any expose tanks or watever not taking cover.
Or how about bridges, troupe implacement and blds, that if hit by the IR bullet signal, would collaps, surender or explode. This would tie in with the pillbox. Give something else to go after.
Guess I need to finaly build that complex IR pulse receiver/recorder I been planing on for the last few years.