The state called Chen Xin back to the country because, as he feared, the counterattack against the alien creatures was not progressing smoothly.
One of the main reasons is that all human weapons are currently developed on the premise of ground operations; all kinds of heavy firepower effectively have no place to exert their strength underground.
Although the military initially asked Chen Xin to specially develop some equipment when planning the counterattack operations, and these pieces of equipment did perform well in the counterattacks, the narrow underground caves still severely restricted the military's operations.
Putting other issues aside, the mere problem of bullets ricocheting off the stone walls of the underground caves has given the military a major headache.
