Okla M. Walls entered the military service in Oklahoma. He served in the U.S. Army during World War I as a Private in the 101st Field Signal Battalion, 26th Infantry Division. He died on November 10, 1918 and is now buried in Meuse-Argonne American Cemetery and Memorial, Romagne-sous-Montfaucon, Departement de la Meuse, Lorraine, France. He was awarded the Distinguished Service Cross for extraordinary heroism in action at Marcheville, France, September 26, 1918. Preparatory to establishing telephone communication from the leading elements to the rear, Private Walls voluntarily reconnoitered an area swept by heavy artillery and machine-gun fire, locating forward positions in which wires could be strung. General Orders No. No. 139, W.D., 1918.