1944年6月,盟军在诺曼底登陆成功,开辟了欧洲第二战场。德军陷入了东西两线同时作战的困境。希特勒为了挽回败局,对英国使用了其最新研制成功的“王牌武器”——V-1型导弹。这是导弹第一次正式在战场上亮相。1944年9月,法西斯德国又在此基础上研制出第二种导弹——V-2型导弹,并袭击了英国。V-2型导弹是弹道式导弹,性能较V-1导弹有较大提高。V-1型和V-2型导弹的出现使盟军大为震惊。其中反应最强烈的是美国,特别是当美军占领德国的一部分领土后发现,美国的科学和工业同德国相比至少落后25年。 June 1944, the Allies successfully landed in Normandy, Europe opened up the second battlefield. The Germans were caught in the dilemma of fighting both east and west at the same time. In order to save the defeat, Hitler used Britain’s newly developed “ace weapon” V-1 missile. This is the first time a missile is unveiled on the battlefield. In September 1944, on the basis of this, fascist Germany developed the second missile, the V-2, and attacked the United Kingdom. V-2 missile is a ballistic missile, V-1 missile performance has greatly improved. The emergence of the V-1 and V-2 missiles astonished the Allies. The most reactionary of these was the United States. Especially when the U.S. forces occupied part of Germany’s territory, they found that the science and industry in the United States lagged behind Germany by at least 25 years.