In the case of the Niland brothers, U.S. intelligence believed that all but one of four siblings were killed in action.
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The letter is frequently mentioned in America in relation to the topic of siblings going to war, such as when discussing the Sullivan brothers, the Niland brothers, the Borgstrom brothers, and the Sole Survivor Policy of the United States military.
As a direct result of the Sullivans' deaths (and the deaths of four of the Borgstrom brothers within a few months of each other two years later), the U.S. War Department adopted the Sole Survivor Policy.