Shoulder sleeve insignia (SSI) are cloth emblems worn on the shoulders of US Army uniforms to identify the primary headquarters to which a soldier is assigned. The SSI of some army divisions have become known in popular culture.

Shoulder sleeve insignia (SSI) are distinctive cloth patches worn on the left sleeve of the United States Army uniform just below the shoulder seam by soldiers assigned to divisions, corps, armies, and other specifically authorized organizations. They are also worn on the right sleeve by soldiers to indicate former overseas service with certain units during periods of U.S. military operations in hostile conditions (MOHC).