In 1941 the Jeep entered production with Willys, Ford and Bantam, next the US Motor Transport Board set up a project designated ‘QMC-4 1/4 Ton Truck Light Amphibian’. As the war progressed bridges over Europe's rivers were being taken out one after another by the retreating Germans. An ideal solution was to create a jeep that could swim as well as drive.

Following on from the DUKW amphibious truck Roderick Stephens Jr. of Sparkman & Stephens Inc. yacht designers, designed the shape for a 1200kg (2700lbs) amphibious jeep. Not surprisingly Stephens' hull design looked like a miniature version of that of the DUKW. The design maintained many of the DUKW features such as a screw propeller and a rudder.

The construction of the vehicle was developed in competition by Marmon-Herrington and the Ford Motor Company. After a direct comparison of the two company's prototypes, Ford received a contract for production starting in 1942.

nstead of equipping your Tansporter Platoon (Page 16, Hammer and Sickle) with trucks you can choose to upgrade them to Ford GPA Amphibious Jeeps for +5 points for the platoon.