This July 16, 1945, file photo shows the mushroom cloud of the first atomic explosion at Trinity Test Site near Alamogordo, N.M. A visit by The head of the National Nuclear Security Administration, Lisa Gordon-Hagerty coincides with the 75th anniversary of the Trinity Test in southern New Mexico, which marked the world's first atomic blast on July 16, 1945. She's scheduled to lead a commemoration on Thursday, July 16, 2020, at the historic V-Site at Los Alamos National Laboratory, where early testing and some assembly of the atomic bomb took place. (AP Photo/File)
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