[SauronOfMordor]

The 5.56 was intended to be used in a war of attrition against the might of the Soviet Union. A dead enemy soldier consumes little to no enemy resources (if the enemy is someone like a Western country or the Soviets); a wounded one takes three people out of battle, at a minimum - someone has to haul him back to the aid station or hospital, someone else has to patch him up, and a third person has to nurse him back to health.

This works against us when we have an enemy that decides to simply leave his wounded for US to take care of

[RunningWolf]

Things can change fast when driven by hard realities.