Let’s say that shortly after World War 2, for whatever reason the American military bureaucracy accepts an intermediate rifle round like .280 British. (Maybe the Germans deploy the STG-44 in large numbers on the Western Front, or Colonel Renée Studler, head of the US Small Arms Bureau, is replaced with someone more amenable.) The FN FAL is chambered in this intermediate round, and it becomes the standard issue rifle of nearly every NATO country. An existing round such as .30-06 or 7.92 Mauser becomes the NATO standard for sharpshooters and machine guns. Would this ultimately be a good thing for NATO? Could it change the outcome of the Korean War or Vietnam War? And considering that this would probably butterfly away the AR-15 and 5.56 NATO, would an FN FAL chambered in .280 British compare favorably to the M16?