M24 Chaffee, Vol. 2: Chaffee-Based Vehicle Variants in the Korean War. David Doyle. 9" x 9". The M24 Chaffee was the finest light tank developed by the US during WWII. Utilizing the M24 chassis—developed by Cadillac—the US Army procured a family of fighting vehicles, including the M19 Twin 40 mm Gun Motor Carriage, the M37 105 mm Howitzer Motor Carriage, and the M41 155 mm Howitzer Motor Carriage, all of which are covered in this second volume on the Chaffee.