In 1931 the German General Staff accepted a plan for two types of tank, a medium tank with a 75 mm gun and a lighter vehicle with a 37 mm gun. While design and then construction work was carried out, the German army used a variety of light tanks based on the British Carden-Loyd tankette chassis. The early tanks were code-named "Landwirtschaftlicher Schlepper" (La S, "agricultural hauler"), a designation that lasted until 1938. The first of these light tanks ran in early 1934. It was a five-ton Krupp design which was dubbed the LKA1. The new government approved an initial order for 150 in 1934 as the "1A La S Krupp". Around 1,500 of these light tanks were built.