Across the planet, at almost the same time, an invasion from space was made. All the largest cities have been captured, military bases destroyed. The armies of states are practically bloodless and demoralized. People did not even have time to figure out what was happening, and therefore did not respond to the attack properly. Panic began, the heads of state were evacuated to the bunkers, but not all had time. By and large, ordinary people were one on one with the aliens, and these creatures were not going to stand on ceremony. They began the systematic destruction of people, clearing the territory for their race. You were in the army during the invasion. When the base was bombed, you miraculously managed to survive. You decided to return to your hometown and fight with alien aggressors as far as possible in Strong Kills 2.
