During the Vietnam War, the use of the helicopter, known as "Air Mobile", was an essential tool for conducting the war. In fact, the whole conduct and strategy of the war depended on it. Vietnam was the first time the helicopter was used on a major scale, and in such important roles. Search and destroy missions, for example, would have been nearly impossible without it. Helicopters allowed American commanders to move large numbers of troops to virtually anywhere, regardless of the terrain or roads. Troops could also be easily resupplied in remote areas. The helicopter also provided another new and vital capability: medical evacuation. It could fly wounded soldiers to aid stations very quickly, usually within the critical first hour. This gave wounded soldiers a higher chance of survival in Vietnam than in any previous war. The helicopter was also adapted for many other roles in Vietnam, including ground attack, reconnaissance, and electronic warfare. Without the helicopter, the war would have been fought very differently.