The Mil Design Bureau, led by Mikhail Leonteyevich Mil, was one of the
leading Soviet plants promoting combination of helicopters and
firepower. Mil was personally involved in the development of a prewar
A-7 autogyro equipped with a machine gun for its own defense and two
more for destroying ground targets. However, this type did not reach
mass production. But Mil continued thinking about arming the rotorcraft,
especially during his practice design of several Bratukhin helicopters,
of which some models were intended for artillery spotting and clearly
showed that helicopters could play an important role in the army and
could be a part of front line units. When the Mi-1 helicopter was test
flown for the first time on 20th of September 1948, it was clear that a
very versatile type was born. It became the first mass produced Soviet
helicopter with a wide variety of special variants for both civil and
military applications. It had just entered the regular service with the
Soviet Army, when US forces began using their Bell OH-13s for attack
missions in Korean War.