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Card decks with 52 aces of spades were used for psych warfare in Vietnam

During the Vietnam War, American soldiers started hearing rumors that the Vietnamese were very superstitious about the ace of spades. So Cincinnati's U.S. Playing Card Co. responded by printing decks of nothing but ace of spades—and sending them for free to GIs in Vietnam for the purposes of "psychological warfare." » 12/29/14 2:43pm 12/29/14 2:43pm