Noun
GPMG (plural GPMGs)
Initialism of general-purpose machine gun. (GP + MG)
The M60 machine gun GPMG (General Purpose Machine Gun) was the main machine gun of the US army at the time and many of them were put on helicopters, to provide suppressive fire when landing in hostile regions. Source: Internet
The WMIK consists of a driver, a raised gun, usually a Browning heavy machine gun or a grenade machine gun, this used for ground support, and a GPMG (general-purpose machine gunner) located next to the driver, this used for vehicle protection. Source: Internet