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 pre-war A-7 autogyro equipped with machine gun for its own defence and two more for ground targets destroying. However, this type did not reach mass production. But Mil was since that time thinking about arming the rotorcraft, especially after his practise during design of several Bratukhin helicopters, of which some models were intended for artillery spotting and clearly showed that helicopter can play an important role in the army and can 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 a very versatile type was born. It became the first mass produced soviet helicopter with vide variety of special variants both for civil and military applications. It has just entered the regular service with the Soviet Army, when US forces used their Bell OH-13s for attack missions in Korean War.