The Type 87 SPAAG (self-propelled anti-aircraft gun) is a Japanese air defense weapon built around the Oerlikon 35 mm twin cannon system used on the Gepard tank. The system uses a modified Type 74 tank chassis. It is also nicknamed by field officers as Guntank after the similar looking mobile suit in the Mobile Suit Gundam series.
It had been developed in 1987, given the Type 87 designation status, with Mitsubishi Heavy Industries providing the chassis and Japan Steel Works providing the cannon system. Initially, the chassis of the Type 61 tank would be used. Later, it had been rejected and had the chassis of the Type 74 tank used instead as a basis for producing the Type 87 SPAAG.
Prior to its development, tests had begun underway in 1982 with a prototype SPAAG unit manufactured in 1983.