High Quality Content by WIKIPEDIA articles! The Spruce Production Division was a unit of the United States Army established in 1917 to supply the army with high quality spruce and other wood products needed for the production of aircraft for the United States war effort in World War I. The division was part of the Army Signal Corps`s Aviation Section. Its headquarters were in Portland, Oregon, and its main operations center was at Vancouver Barracks in Vancouver, Washington. Workers in the division were members of the Loyal Legion of Loggers and Lumbermen, a union specifically established to support the army`s wood production operations.