Entry and exit from Changhe Base were very strict.
Aside from being authorized by the military, City Hall, and other authoritative departments, ordinary people who wanted to enter or exit the city had to register as a force first, enroll as field staff within the force, then apply, and only after approval could they leave.
The reason for these complications was naturally due to the zombie virus. At any time, one could not slacken the protection against the virus. The so-called 'a dike collapses because of an ant hole,' many bases were destroyed not because they encountered irresistible disasters, but because the defenses were inadequate, allowing the zombie virus to break through from the inside... Therefore, Changhe Base was particularly strict in this regard.
