This was because the military preparation hall was the place where the Tai Yi sect fought with the outer sects for territory all year round.
Once there was a change at the border, the entire military preparation hall would usually move out together.
And once they moved out, it would be a life-and-death battle.
Hence, the death rate of the military preparation hall was extremely high.
In addition, in the past hundred years, the end of the epoch was near, and the various sects and sects increased the competition for resources, resulting in frequent wars.
The members of the military preparation hall, no matter how valiant and good at fighting, would definitely not live past three years.
You might be able to survive this war, but what about the next one? What about the next one?
There would always be accidents, and once an accident happened, it would be death.