This version was accepted into service after testing in 1934.[20] Although these tanks were referred to as the La S and LKA well beyond the start of production, its official designation, assigned in 1938, was Panzerkampfwagen I Ausführung. A ('model A' or, more accurately, 'batch A').[21] The first fifteen tanks, produced between February and March 1934, did not include the rotating turret and were used for crew training.[22] Following these, production was switched to the combat version of the tank.