When family members arrived on the scene in Eagle County, Colorado, their loved ones had already been disappeared by federal agents. But what they found inside the vehicles was disturbing: a customized ace of spades playing card — popularly known as a “death card” — that read “ICE Denver Field Office.”

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During the Vietnam War, U.S. troops regularly adorned Vietnamese corpses with “death cards” — either an ace of spades or a custom-printed business card claiming credit for their kills. A 1966 entry in the Congressional Record noted that due to supposed Vietnamese superstitions regarding the ace of spades, “the U.S. Playing Card Co. had been furnishing thousands of these cards free to U.S. servicemen in Vietnam who requested them.”

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This isn’t the first time that immigration agents have used similar imagery during the Trump administration’s ongoing deportation campaign. This summer, for example, a Border Patrol agent taking part in immigration raids in Chicago wore the image of a skull with a spade on its forehead affixed to his helmet below another unidentified but apparently unofficial patch. Customs and Border Protection did not respond to a request for comment.