[1] In 1960 Andreasson returned to Sweden and started working at Malmö Flygindustri where he designed an improved version of the BA-7 that went into production as the MFI-9 Junior.

The name and concept originated with Carl Gustaf von Rosen, who realized that in a low intensity conflict even a few small, minimally armed aircraft are capable of having a significant impact.

Von Rosen was familiar with the military trainer version of the MFI-9, which was robust enough to be able to carry significant loads of ordnance suspended from hard points on the wings.

So in May 1969, von Rosen formed a squadron of five MiniCOINs to fight in the Nigerian Civil War (1967–1970) on the side of the Biafrans in support of their effort to create an independent state.

On 22 May 1969, and over the next few days, Von Rosen and his five aircraft launched attacks against Nigerian airfields at Port Harcourt, Enugu, Benin and other small airports.

The Nigerians were taken by surprise and a number of expensive jets, including a few MiG-17 fighters and three of Nigeria's six Ilyushin Il-28 bombers, were destroyed on the ground.