I'll take any reasonable evidence this is true. All modern wars have seen many more people killed with crew-served weapons than individual rifles.remember. wars are decided by a round that drops 6 inches less at 600 yds then the other guys round does
There is something called "the myth of the American rifleman" which is a mistaken idea that US wars have been won by superior individual marksmanship. It's just that...a myth. While better shooting rarely hurts, again, logistics (as cap said), superior leadership, and crew served weapons win wars.