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Modified and derivative vehicles . Simultaneous to the production of the battle tanks, a number of engineering, bridging and recovery vehicles were developed, as well as a number of versions used in the anti-aircraft role. In the Netherlands, an improved version equivalent to the A5 called "Leopard 1 Verbeterd" (improved) was developed, the same version is used by the Chilean Army. The most well known Leopard variants are the Bergepanzer Engineer Vehicle and the Gepard SP Anti-Aircraft Gun. The Warsaw Pact equivalent of the Gepard is the ZSU-23-4. There was also a British SPAAG version called Leopard Marksman, which was equipped with the Marksman turret. The Canadian Army operates the Beaver bridgelayer, Taurus ARV, and Badger AEV, all based on the Leopard 1. The United Kingdom's Royal Marines operate a vehicle known as the Hippo BARV (or Beach Armoured Recovery Vehicle). The Hippo is a conversion of a Leopard 1A5 chassis by ALVIS Moelv. The main alteration has been the replacement of the turret with a raised superstructure that resembles the wheelhouse of a boat. The original 830 hp (634 kW) diesel engine has been retained, but the gearing of the transmission had been lowered, reducing the vehicle's road speed to 32 km/h (20 mph), but increasing tractive effort to 250 kN (56,000 lbf). Other modifications include the addition of working platforms, a nosing block, raised air intakes and an Auxiliary power unit; this has raised the weight of the vehicle from 42.5 tonnes to 50 tonnes. The Hippo has a fording depth of 2.95 m (10 ft) and can pull vehicles up to 50 tonnes weight or push off from the beach a 240 tonne displacement landing craft. Gilded Leopard, Eber and Keiler When the MBT-70 program was ended, a further contract was offered under the name Boar (Eber), with an emphasis on using as many technologies from the MBT-70 as possible, but without the problematic combined gun – rocket launcher. Two prototype vehicles were constructed using a new chassis from Porsche with the road wheels from the MBT-70 and the original Leopard engine, combined with a new Wegmann turret mounting the MBT-70's Rheinmetall 120 mm smoothbore gun (although some also mounted the original 105 mm). These were considered promising enough that seven more were ordered, this time powered by the MTU engine designed for the MBT-70. When this happened, the Experimentalentwicklung team went public with their alternative design which they called the Keiler (a synonym of Eber). In 1971, the minister of defence, Helmut Schmidt, decided to abandon the Eber-project and build 17 prototypes of a Leopard 2, based on the Keiler design, which had a turret with spaced sloped armour. The maximum weight was to be 50 metric tons. Leopard 1A5 In 1980, a research program was undertaken to study further improvements to the Leopard 1, providing it with a completely modern fire control system and fully effective night/bad-weather vision system. The decision was made to base the upgrades on the earlier models, which were no longer competitive. The resulting Leopard 1A5 was based on 1,225 vehicles of the Leopard 1A1A1 model. The turrets were again modified for the 1A5, both in order to store all of the new equipment, as well as to move more of the ammunition into the rear of the turret, as opposed to the left side of the driver where it had previously been stored. The new turret was also able to mount the newer 120 mm gun from the Leopard 2 if desired, although this option has not been used.