US Army Helmet M1917 with 91th Infantry Division decal

The 91st Infantry Division ("Wild West Division"), activated in August 1917 at Camp Lewis, Washington, was a National Army unit composed of draftees from the far-western United States that fought in major 1918 WWI offensives in France and Belgium. Renowned for their "Fir Tree" insignia, they saw intense action in the Meuse-Argonne and Ypres-Lys campaigns