In (, mao March tenth day), April 3, 1963, China shot down an American unmanned high-altitude reconnaissance aircraft. was shot down


the American unmanned high-altitude reconnaissance aircraft
1963, American unmanned high-altitude reconnaissance plane violated Chinese airspace and shot down by the Chinese Air Force.
the mid-60, the U.S. government regularly sent military reconnaissance aircraft invade mainland China over spying on military and economic intelligence, serious harm to China's security.