order to avoid blast and shock injuries to the crew when hit by a mine. Applied to 74 Marder 1 A3s only. Marder 1 A5A1 (2010–2011): Equipped with an air conditioning system, a jammer for IED-protection and multi-spectral camouflage. In December 2010 ten vehicles were brought to this standard, with a further 25 to be upgraded by August 2011. Derivative models The Marder served as the basis for Thyssen-Henschel's medium tank design which became the TAM for Argentina. A simplified version of the Marder is also employed as an infantry fighting vehicle, mortar carrier and command vehicle by the Argentine Army, realising most of the versions originally planned for the Bundeswehr and later abandoned due to costs and/or the availability of cheap alternatives like the M106 mortar carrier. The Marder is used as a carrier for the Roland air defence system. The Kanonenjagdpanzer and Raketenjagdpanzer 2 started development as part of the Marder family but were realised based on the second batch of prototypes using different engines etc. The Kanonenjagdpanzer built for Belgium are a hybrid between the original Bundeswehr version and Marder parts. Some 4–6 test models of a 120 mm mortar on a Marder chassis were built, and at least one is in use as a firefighting vehicle at the WTS Meppen. Tests with an AAA tank were performed but the high weight of the system resulted in a switch to the heavier Standardpanzer chassis, resulting in the Gepard AAA system. At least one first or second generation prototype was equipped with the 110 mm artillery rocket system that later became the truck-mounted LARS system. During the Eurosatory Show 2012, Rheinmetall Landsysteme GmbH offered two further upgrades as part of the Marder Evolution family. The first upgrade was the Marder APC which features a new M151 Protector remotely controlled weapon, replacing the original Rheinmetall MK 20 Rh 202 automatic cannon, ballistic protection comparable to STANAG Level 4+, and mine protection comparable to Level 3a/3b+. The top deck has been lifted to enable improved ergonomics and uses a MTU MB883 diesel. The other upgrade was the Marder Medium Tank which features a rifled, stabilized 105 mm OTO-Melara gun in a new turret. At Indo Defence 2016, Rheinmetall exhibited the Marder Medium Tank RI ("RI" stands for "Republic of Indonesia"), which was offered to the Indonesian Army, at the time already operating the Marder 1A3. The tank used the Marder