 The first use of medevac with helicopters was the evacuation of three British pilot combat casualties by a US Army Sikorsky in Burma during WW2, and the first dedicated use of helicopters by U.S. forces occurred during the Korean War, between 1950 and 1953.The French used light helicopters in the First Indochina War.While popularly depicted as simply removing casualties from the battlefield (which they did), helicopters in the Korean War also moved critical patients to hospital ships after initial emergency treatment in field hospitals.