The first prototypes of the Kanonenjagdpanzer were built in 1960 on the hulls of the
HS-30 Armoured Personnel Carriers (APC) by
Hanomag and
Henschel for
West Germany and by
Mowag for Switzerland, A second round of six prototypes this time built just by Hanomag and Henschel were constructed between 1962 and 1963. After that another set of six prototypes were built over the next two years still by Hanomag and Henschel. At least one prototype with the designation
Gepard was built by the Mowag firm; it stands today in the
Swiss Military Museum at
Full. For the Gepard two different two-stroke diesel engines were available, a five-cylinder, 6.7 litre, Type M5 DU Mowag generating 270 horsepower (199 kW) at 2,100 rpm and an 13.5 litre engine generating 540 horsepower (397 kW). Between 1966 and 1967, 770 units were built for the
Bundeswehr, 385 by
Hanomag and 385 by
Henschel. Eighty of them were delivered to Belgium from April 1975 onward. When the Soviets began deploying their
T-64 and
T-72 main battle tanks, the 90 mm gun was not capable of engaging them in long-range combat and the Kanonenjagdpanzer became obsolete. Although the producers claimed it could be rearmed with a 105 mm gun, Some Kanonenjagdpanzer remained in service with the
Heimatschutztruppe (Homeland Security Force) until 1991. ==Design==