On a blue shield 2 inches in width and 2 1/2 inches in height, the shoulder sleeve insignia of the Army Service Forces proper, 5/8 inch in diameter within the upper portion of a white interrogation mark, the lower portion of which terminates into a lightning flash. At base a yellow point 9/16 inch in diameter cracked in blue.
The shield is blue for the universe; the Army Service Force shoulder sleeve insignia represents the origin of the command; the interrogation mark, the unknown results and secrecy surrounding the project of the Manhattan District; culminating in the atomic fission that stirred the world by its most devastating results.
The insignia was approved on August 20, 1945 and cancelled on May 6, 1947.