friendly fire
oh my ! you are ALL so young !
Vietnam ( in the 'nam, when there were "gooks in the wire", they didnt kill americans, their own side did )
If a platoon commander was too keen on killing gooks, they would first roll a grenade wiv pin in, under his bed and then if he kept it up ( his enthusiasm that is!) it may be set off or he might shoot himself
fragging - - - -
https://en.wikipedia.org/wiki/Fragging
y'all really knew that - you didnt need know-all PP to tell you what went on 50y ago in the Pacific