The "Atomic Bomb Mission" to Japan. Sent to the study the Atomic Bombs effects and if the Japanese had an Atomic Bomb program. Unlike the "Alsos Mission" to Germany which concluded that Germany never came close to building an Atomic Bomb this Mission found something. According to author Robert K. Wilcox in his book JAPAN'S SECRET WAR they discovered one of the best kept secrets of World War II and the Cold War. Bud Uanna describes their work in an employment application to the Department of Commerce in 1950 as "In September 1945 I was assigned with certain scientists and medical men to Japan and spent four weeks in Nagasaki studying and reporting bomb damage and radiation, medical case histories, etc., impounding records and safeguarding information from certain representatives of a foreign government which representatives included five Generals and several scientists." This agrees with Wilcox's account. Uanna is seated fourth from the left with the moustache. Third from the left appears to be Robert Serber. Serber was Robert Oppenheimer's protégé and a member of the First Technical Service Detachment on Tinian. At Los Alamos he had written the "Los Alamos Primer" which was presented in a lecture to new scientists when they arrived. Written in 1943 it was a briefing manual on what was know about building atomic bombs.
Security Chief Major William "Bud" Uanna.
Manhattan Engineer District Atomic Bomb Mission to Japan