The Schützenpanzer Marder 1 (; "Schützen" carrying "Armour"-ed fighting vehicle "Marten 1") is a tracked German infantry fighting vehicle designed for use with the West German Panzergrenadiere units, mechanized infantry specialized for IFV combat. It has been operated by the German Army as the main Panzergrenadiere IFV from 1970s through to the present day. Developed as part of the rebuilding of West Germany's armoured fighting vehicle industry, the Marder has proven to be a successful and solid infantry fighting vehicle design. While it used to include a few unique features, such as a fully remote machine gun on the rear deck and gun ports on the sides for infantry to fire through, these features have been deleted or streamlined in later upgrade packages to bring it more in line with modern IFV design. The MG has been moved to be a coaxial, the gun ports entirely welded shut and uparmored. It is overall a simple and conventional machine with one large rear exit hatch and three top hatches for mounted infantry to fire from. Around 2,100 were taken into service by the West German army in the early 1970s, but the vehicle in its German variant was not sold to any foreign militaries. As the West German Army began to retire older vehicles, the Chilean government agreed to acquire 200 Marders; the government of Greece has considered the purchase of 450 retired vehicles in the past. Argentina uses a simplified and locally produced variant, the VCTP, and has a number of vehicles based on that platform constructed by Henschel and built by TAMSE. The intended successor to the Marder 1 was initially the Marder 2 project in the 1990s, but after its cancellation the successor became the Puma in the 2010s. The Marder is currently being replaced by the Puma. Development Development of the Marder ran from January 1960, when the first development contracts were issued, to May 1971, when the first production vehicles were given to the West German army. The vehicle was intended to be an improvement over the Schützenpanzer Lang HS.30. The main requirements were: A capacity of 12 infantrymen. A more reliable 20 mm cannon. The infantry must be able to fight from within the vehicle or dismounted. Protection from nuclear, biological and chemical weapons. Initially, development contracts were awarded to two groups of companies: the Rheinstahl group (Rheinstahl-Hanomag, Ruhrstahl, Witten-Annen, Büro Warnecke) and the second