Commonly referred to as a unit crest, the Distinctive Unit Insignia (DUI) for the United States Army Strategic Defense Command was approved on 18 May 1987. Inside the shield is a stylized rendering of our planet, with the green area depicting the earth, the blue denoting the atmosphere, and the black area outer space.
The yellow rays symbolize attacks coming from outer space, with the pheons (arrowheads) inside nebuly (clouds) poised to protect the world from the incoming threat. In heraldry, the color green is associated with life, growth, and regeneration, while the yellow star is a symbol of hope; combined, they invoke the concept of the quest for world peace, the ultimate goal of the Strategic Defense Command. NE TRANSEANT, the organization’s motto, is Latin for “They Shall Not Pass."
The U.S. Army Strategic Defense Command was redesignated as the U.S. Army Space and Strategic Defense Command in 1992, and five years later it was given its current designation as the U.S. Army Space and Missile Defense Command.
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Also known as a unit crest or DUI, the Distinctive Unit Insignia is worn by all Soldiers (except General Officers) in units that have been authorized to be issued the device. It is worn centered on the shoulder loops of the Army Green Service Uniform (AGSU) and the blue Army Service Uniform (ASU, Enlisted only) with the base of the insignia toward the outside shoulder seam. DUIs are not worn on the Dress variations of either uniform, however.
Full guidance on wear of the DUI is found in DA Pamphlet 670-1,
Section 21-22, "Distinctive unit insignia."