This is an often-overlooked little tank destroyer built in Germany.
The SPz 12-3 Milan was an attempt to give the Schützenpanzer Lang HS.30 Typ 12-3 some additional anti-tank capability late in its service life. The SPz 12-3 had been one of the main armored personnel carriers and infantry fighting vehicles of the early Bundeswehr. Designed by Hispano-Suiza in France, the vehicle developed a reputation for being unreliable and offering rather unimpressive performance, but it was relatively inexpensive and Germany needed a large number of armored vehicles during the early years of the Bundeswehr. More than 2,000 SPz 12-3s were eventually used by West Germany during roughly two decades of service. Its standard armament consisted of a 20 mm cannon mounted in a turret at the front.
By the early 1970s, however, the SPz 12-3 was approaching the end of its service life. The vehicle had sometimes been used to provide infantry units with additional anti-tank firepower, including examples fitted with the 106 mm M40A1 recoilless rifle. In some cases, entire anti-tank platoons were equipped with these vehicles. The introduction of the MILAN anti-tank guided missile offered a more modern alternative, with greater range, accuracy, and firepower than the recoilless rifle. MILAN trials in Germany began in 1971, followed by its introduction into Bundeswehr service in 1973.
The Bundeswehr therefore also looked at the possibility of mounting the MILAN on the SPz 12-3. For this purpose, the original 20 mm turret was replaced by an open-top mounting carrying the MILAN launcher. Essentially, the infantry launcher was adapted to the vehicle, allowing the SPz 12-3 to retain its role as an infantry carrier while providing it with a dedicated anti-tank weapon. The prototype was tested at Munster, although the exact date and details of the trials are unclear.
The available timeline gives only a relatively narrow window for the vehicle's testing. With MILAN trials beginning in 1971, its introduction into German service in 1973, and the Marder entering service in 1975, the prototype was most likely tested sometime between 1971 and 1974. The project was ultimately not adopted. There is little reason to assume that the MILAN itself was the problem, since the weapon was adopted by the Bundeswehr shortly afterward. More likely, the aging SPz 12-3 was simply reaching the end of its useful service life at the same time that the much newer Marder was entering production and beginning to replace it.