MFI-9 MiniCOIN (an acronym for "Miniature Counter-Insurrection").
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. Light aircraft are in any event more suitable for operation in the primitive conditions typical in such conflicts. 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. The aircraft were equipped wit two 6 x 68 mm Matra anti-armor rocket pods and had no defensive armaments.
Count G. Von Rosen was originaly a Swedish nobleman and air force officer that for most of his life post WW-2 worked as a military adviser on air force matters to emperor Haile Selassie of Ethiopia. During the Biafran war he took leave from his duties in Ethiopia and worked first with "the Gods airline" flying humanitarian aid missions with old Constelation and Skymaster piston engined transport planes to Biafra.Somewhat disenchanted with this passive role, he more or less built up a small Biafran airforce on his own, centered around 7 MFI-9 piston engined primary trainers (MFI = Malmö flygindustri).They were given simple sights and two pods for six 68 mm anti-armor rockets and an extra fuel tank in the fuselage. The mosquito-like planes were nicknamed "Biafran Babies." At first, the squadron had three Biafran and three Swedish pilots.
On May 22, 1969, and over the next few days, Von Rosen and his five aircraft launched attacks against Nigerian air fields 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 out of Nigeria's six Ilyushin Il-28 bombers, were destroyed on the ground.
"Port Harcourt Airbase Attack- May 22, 1969" painting by John Young