It is said that the CIA found that a large number of teams are active in southern China every year. What's the joke?

That was when the reconnaissance plane only detected the south over the South China Sea. Later, after all the satellites were detected, it reported to Congress that recruits were being trained in every corner of China, and the number might exceed 100 million. The president hasn't slept for three days. As a result, the embassy said that China was a military training student! The president laughed his head off.