Lynx version because it could elevate or depress its 90mm cannon over a wider range for operations in steep mountain terrain. Further export orders followed. Both nations also appreciated the all-terrain mobility of the Lynx which is enhanced by the capability to raise or lower the central pair of wheels depending on terrain condition, especially in sandy or muddy ground. All versions of the ERC are also equipped with two hydrojets behind the rear wheels and require no preparation for amphibious operations. ERC 90 F4 Sagaie Shortly after the ERC 90 F1 Lynx had been built for export, Panhard recognized the need for a cost-effective light armoured vehicle that could defeat a more modern main battle tank (MBT), like the Russian T-72 which was being exported to many nations. The Lynx version could only fire medium-velocity HEAT rounds in the anti-tank role, which lacked the penetration to defeat the more modern MBTs. Panhard designed a turret which mounted the long barrel F4 90mm smooth bore-cannon developed by GIAT, and designated the vehicle the ERC 90 F4 Sagaie. The F4 90mm could fire APFSDS (Armour Piercing Fin Stabilised Discarding Sabot) rounds at a much higher velocity than the Lynx's F1 90mm; GIAT and Panhard both claimed it could penetrate heavy armour at 2000 metres. For a while, GIAT engineers could not find a suitable muzzle brake for the Sagaie which would not interfere with the firing of APFSDS rounds, but finally found a suitable solution using a muzzle brake design from the older AMX-13 tank. Ivory Coast was the first export customer, ordering five Sagaies to replace its aging AMX-13s in the light armour role. At this time period, the French Army was organising the Fast Deployment Force (FDF) for overseas military missions, mainly in Africa or the Middle East. The main core of the FDF would be French Army's 9th Marine Infantry Division and 11th Parachute Division. To make the new FDF "more muscular" a new unit was activated, the 31st Heavy Half Brigade (31 DBL) of two regiments. One regiment was to be armed with vehicles mounting the HOT wire-guided missile, and the other with cannon-armed vehicles that could provide both reconnaissance and a limited tank-killing role. The French Army had at first planned on equipping the second regiment with the AMX-10RC, but were told that this vehicle was not suitable for transport by the French Air Force Transall