1944年4月21日,美国陆军一架轻型飞机L-1载着3名负伤的英国士兵,迫降在日本防线后面160公里的缅甸丛林中。4天后,这些人被美国陆军一架YR-4直升机驾驶员在空中发现,该机在两天时间内先后往返3次,从丛林中救出了飞行员和全部受伤的英国士兵。这就是世界上第一次直升机空中救援行动。据统计,从1951年1月3日首次在朝鲜进行 On April 21, 1944, a U.S. Army light aircraft, L-1, carried three wounded British soldiers and forced them to land in the Burmese jungle, 160 kilometers behind the Japanese line of defense. Four days later, they were spotted in the air by a U.S. Army YR-4 helicopter pilot who had flown three times in two days and rescued pilots and all wounded British soldiers from the jungle. This is the first helicopter air rescue operation in the world. According to statistics, from January 3, 1951 for the first time in North Korea