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One after another, the Kuomintang Air Force spy planes carrying out top-secret missions were shot down on the Chinese mainland one after another. It was a hidden history. Sun Tzu said: "Know yourself and the enemy, and a hundred battles will be fought without success." In the history of Chinese and foreign wars in ancient and modern times, whoever has accurate and detailed military intelligence on either side of the enemy holds the key to defeating the opponent. Therefore, military intelligence has always been a target pursued by both hostile parties at any cost. In modern times, aircraft have always been an important means and way to obtain military intelligence due to their fast speed, high efficiency, large coverage, and low casualties.