I thought the idea behind the 5.56 was to cause injury on the battlefield, as it takes 4 guys to haul out one injured soldier, thus taking 5 people out of the fight.

Kill a guy on the battlefield and you don't need to do anything to them, aside from removing the body after the fight. The 4 other guys that would be needed to remove an injured soldier are left to fight.

Logistics wins wars.
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Tule King Paker