The Mil Mi-8 (NATO reporting name "Hip") is a medium twin-turbine transport helicopter that can also act as a gunship. The first single-engine (AI-24W) prototype, W-8, flew in 9 July 1961. A second one with two AI-24W engines made its first flight on 17 September 1962. After few changes it was introduced into the Soviet Air Force by 1967 as Mi-8.
The Mi-8is the world's most-produced helicopter, and is used by over 50 countries. There are numerous variants, including the Mi-8T which is armed with rockets and anti-tank guided missiles, in addition to carrying twenty four soldiers. The Mil Mi-17 export version is employed by around 20 countries; its equivalent in Russian service in the Mi-8M series. The naval Mil Mi-14 and attack Mil Mi-24 and Mil Mi-35 are also derived from the Mi-8.