The Sino-Soviet Union has been the first of the three bloc to develop the technology of helicopters. Since then the other bloc, mostly the Allies have followed. But the SSU still has a nice advance in this cutting edge technology. Although the Soviets mostly use their helicopter for combat missions or to deploy troops, they also have transformed some to carry back wounded personnel to the safety of the rear lines. Thanks to these, the SSU has greatly increased the life expectancy of its soldiers.