A more powerful  Fifa coins    blaster might be more effective and might be able to out-range Kalashnikovs and RPGs – but anything louder than LRAD would be unsafe at shorter ranges, and there would be an even greater chance of damage to the operators or other crewmembers. Back to the drawing board with this one.

The Active Denial pain ray, which fires a beam of skin-heating microwaves, has the range to do the job – more than 750 meters – and…