1950, Comrade Qian Xuesen began to strive to return to the motherland. Kimble, then undersecretary of the US Navy, declared: "Qian Xuesen is worth five divisions wherever he goes. I would rather kill him in America than let him leave. " Comrade Qian Xuesen was persecuted by the American government, placed under house arrest and lost his freedom. 1955 10 After Premier Zhou Enlai's continuous efforts in diplomatic negotiations with the United States-even at the expense of releasing 15 senior American generals captured in the Korean War, Comrade Qian Xuesen finally broke through various obstacles and returned to the motherland. 1958 Since April, I have been the technical director of rocket, missile and spacecraft development for a long time, working for rocket and missile technology in China.