They were the sons of Alben and Gunda Borgstrom of Thatcher, Utah.
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.
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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.