National Museum of Nuclear Science & History
Ralph C. Berger served in the 603rd Air Engineering Squadron.
Staff Sergeant Edward F. O’Mara enlisted in the U.S. Army in 1942. Because of a blood condition, Army officials determined that he was not fit for combat duty.
Marion Mandel was a laboratory technician in the Health Division at the University of Chicago Met Lab.
John J. Norton was a security guard at the University of Chicago’s Metallurgical Laboratory (“Met Lab”) during the Manhattan Project.
