Worn from:
16 August 1945

Activated
19 August 1946 2761st Engineer Battalion (Special)

Redesignated 1 May 1947
38th Engineer Battalion (Special)

1 August 1948, 471st Naval Special Weapons Unit

20 December 1948 Redesignated by the Department of Defense
8460th Special Weapons Group

The patch depicts a small army service forces insignia
in the center of a white question mark that ends in a
lightning flash. The flash and the small disc at the
bottom indicate the smashing of an atom.