The special insignia patch worn by personnel of the United States Army Manhattan Project District. The blue background represents the universe. A white cloud and lightning bolt form a question mark, symbolizing the secrecy of the project. The lightning extends down to split a yellow atom, representing atomic fission. A red and blue star in the center of the question mark is the insignia for the Army Service Forces to which soldiers working on the Manhattan Project were assigned.
- 3” x 2 1/2”
- Made in the USA