The last of the "traditional" Jagdpanzers. Designed and produced during the early to mid-60s, this casemate-style tank destroyer was pretty much built around experienced gained from the previous war by the Wehrmacht, with the then-current design philosophy of Bundeswehr armour. The resulting vehicle had a low silhouette, a relatively punchy gun, and good overall mobility. Overall, the design was quite respectable.

Unfortunately, as with the arms race in the Second World War, the arms race in the Cold War brought a lot of development and/or change to armored warfare, as by the mid-late 60s, the USSR (and likely their western counterparts) were beginning to employ tanks featuring things like composite armor and ERA, and with tanks like the T-64 and T-72 entering service (both of which had armor far greater than what the 90mm on the KanJPz could handle), the Germans were going to need something with more punch. There were some talks about rearming the KanJPz with a 105mm gun, which would have undoubtedly given the tank destroyer that extra punch it needed. As things turned out, however, the KanJPz more or less got repurposed into other vehicle types, such as ATGM-armed tank hunters (designated Jaguar 2). A few unmodified KanJPz managed to remain with the Heimatschutztruppe (Germany's rough equivalent to the National Guard) up until 1991.

Much like the M103, the Kanonenjagdpanzer never really got a chance to see actual combat. In all fairness, this is going to be the case for a wide range of Cold War and Modern Era vehicles, as by this point in our current and most recent history, the threat of nuclear war was a much larger deterrent and concern between the West and East.