M3 VDA (Véhicule de Défense Antiaérienne) Air defence variant armed with twin Hispano-Suiza 820 SL 20mm auto-cannon in a one-man turret. The weapons have a maximum elevation of +85° and a depression of -5°, and a cyclic rate of fire of 200-1,000 rounds per minute if the vehicle is stabilised by four hydraulic jacks. There are 650 rounds of 20mm ammunition on board.The turret is fully powered and can be traversed 360° in three seconds, or elevated to maximum elevation in two seconds. It is also provided with an ESD RA-20 Doppler radar with the capacity to track four incoming targets simultaneously at a range of 8km.VDA was the heaviest M3 variant to ever reach production, and weighs over 7 t.