Food, it always comes down to food.
In the apocalypse, a shortage of food is a crisis for anyone, just a matter of time. If farming can't be restored, a food crisis will inevitably arrive sooner or later.
It's just that the aliens killed most of the people, allowing the survivors to use more reserves to get through the initial difficulties, especially at Kandahar Air Base.
Originally, Kandahar Air Base had enough food reserves for 3400 people for two months, but with the number reduced to about one-fifth, that period could be extended to at least ten months, or even a year.
Speaking of which, Gao Yuan asked Andrew curiously, "What kind of food do you have? How long can it be stored? And do you have storage conditions?"