I always thought that “Yanks” and “doughboys” were the nicknames for American soldiers in World War I. Who knew that there was a brief craze for “Sammies” as in “Uncle Sam’s boys”?
Apparently, they liked to smoke.
Two observations about this one: (1) those are awfully effeminate-looking warriors (not that there’s anything wrong with that) and (2) they were incorrectly using apostrophes to pluralize even back then.