Li Zhen thought he would be assigned to the high-tech command hall and use codes to win thousands of miles.
The reality is that she was thrown into a computer room in the Gobi Desert and stared at the screen for eight hours a day.
Her superior, Huo Xiao, said: "Signals will not become easier just because you sit down."
No one saw what they were doing.
But for every electromagnetic test on the border, someone blocked it in silence.
This is a group of "invisible" soldiers, building a silent line of defense.
