Same in N Ire in the 70s - Friend whilst on 6 monthly check ride had problems talking with CFI. Turned out to be pigtail on helmet had been severed by small arms fire !
Also - self, empty and orbiting safely at 2000' waiting to be called in for ground Pax, noticed a person waving frantically at edge of a field.. Descended to look closer whereupon he picked up his rifle and let fire.
Other happenings - one pilot awarded DFC for flying his heli back to base having been riddled with bullets.