An scarlet indian arrow head, 3 1/8 inches in height and 1 3/8 inches in width, with the horizontal letters USA above the vertical letters CANADA in white.
The arrow represented the heritage of both the United States and Canada.
The lst Special Service Force was activated as a joint Canadian-American unit on July 9, 1942. The shoulder sleeve insignia was approved on September 14, 1942. The unit was disbanded on January 6, 1945.