1939 Delco military prototype built by General Motors. The rear axle was from a Bantam automobile. Most of the motorcycle was a clone of the BMW 750 cc flathead opposed twin. Newsreel and newspaper images of German army combat revealed the Germans relied heavily on motorcycles for message communication and light hauling. In this pre-Jeep era, General Motors saw the potential for producing vast sums of U. S. Army motorcycles.

Via: Flat Out!