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The evaluation and competition to become the service rifle replacing the M1 in the mid-1950's was between Springfield's T44E4 (which became the M14)...
That just may be that unless they are machine gunners they have never used anything but 5.56 in combat.
Granted, the 5.56 NATO will get the job done...
If you do not already have a good rifle, an AR would be a prudent purchase.
I already have quite a few good rifles, several much better than any AR....