Report from a US Colonel in 1971 - collapse of discipline in the US military only exceeded by the Tsarist army in 1917. By the end of the war in Vietnam, 30% of officer casualties were fratricide.

“By the end of the war in Vietnam, 30% of US officer casualties were fratricide. Think of the level of solidarity there was among the rank and file that nobody in the platoon snitched when somebody put a bullet in the lieutenant's back.”