On a pentagon 1 7/8 inches wide, 1 1/2 inches on each vertical side and 1 3/8 inches on each hypotenuse, divided horizontally 1 inch from base blue and red, a white pale 5/8 inch in width charged in the upper portion with a blue star 3/8 inch in diameter.
The unit activated on September 2, 1942 and one of the primary missions was the construction of the Alaska-Canada Highway. The design suggests a winterized pyramid tend. The star represents the North Star, and the white center suggests the highway.
The shoulder sleeve insignia was approved on March 23, 1943. (TIOH Dwg. No. A-1-52)