After the Tunisian campaign, many M6 Fargos had their 37 mm gun removed and reverted to a cargo truck role as the (WC52). Some of these 37 mm guns were mounted onto halftracks to provide the armored infantry with a gun halftrack. Other 37 mm GMC M6 vehicles found their way into service with the French Army, and were later provided to French Forces of the Interior units after the liberation of France. Despite the vehicle's obvious limitations on the battlefields of Northwest Europe 1944–1945, the FFI used practically any vehicle they could obtain because of equipment shortages of all kinds.