National Museum of Nuclear Science & History
Robert Ball was a security guard at the Metallurgical Laboratory in Chicago during the Manhattan Project.
Nick Salazar is a Manhattan Project veteran and a longtime employee of the Los Alamos National Laboratory.
Petersen worked in the 200 West Area at Hanford during the Manhattan Project.
Paul Metro was a member of the 393rd Bomb Squadron in the 509th Composite Group stationed in Wendover, Utah and on Tinian Island in the Pacific.