called the ZT avec boîte à l'avant ("ZT with front gear box") but later received the Renault designation ADF 1, again a meaningless code: Renault had run out of two letter codes. The army, for security reasons, seems not to have used any special name, which led to a later confusion with the Renault YS. Due to a delay in the formulation of the exact specifications for the radio equipment, construction of the first vehicle only began on 14 June 1938. The first two vehicles were sent to Satory on 1 and 2 August 1938. After delivery the Army built in the radio sets; this process was finished for all ten vehicles in the Spring of 1939. The first vehicle used two ER29 sets; the others, conforming to a decision already made in 1936, used a combination of the ER29 and the ER26 ter; in the latter case the effort to remain inconspicuous was rather spoiled by a very prominent large horizontal radio antenna frame fitted on top of the "turret". Renault YS The Renault YS was a version with a large superstructure but without turret, serving as a taller command vehicle. The specifications for such a type had been issued on 9 January 1931: it was then named the Type M. Renault had built two prototypes of boiler plate, based on the AMR 33 chassis, in 1933. General Darius Bloch, head of the technical section of the supreme command, had formed a favourable opinion on these in September 1933 and during a session of the Conseil Consultatif de l'Armement in January 1934 had desired that a dozen be acquired. On 10 April 1934 the order was signed for ten voitures de reconnaissance tous terrain blindés, to be delivered before 31 December 1934, the uncommon term "all-terrain armoured reconnaissance vehicles" intending to obscure the fact that they were command vehicles. They had the factory designation Renault YS. The prototypes had already been rebuilt with the AMR 35 suspension: to avoid a future disappointment Renault explicitly established in the contract that due to the more robust and heavier AMR 35 chassis to be used, the series vehicles would have an inferior performance: the weight would increase from 3.5 to 4.3 tonnes and maximum speed would drop from 60 to 55 km/h; average road speed from 40 to 35 km/h. The ten vehicles, N° 84252 - 84261, were only delivered between 14