Age of Superweapons

A camouflage-green helicopter roared into the air above the provisional government building. Seven or eight fully armed personnel swiftly slid down ropes dangling from the aircraft. The moment they touched the ground, they raised the submachine guns strapped to their chests and opened fire on the crowd passing in front of the building. Flames of gunfire erupted. Amid a wave of agonized screams, many who hadn't even grasped what was happening collapsed in pools of blood.
A world of slaughter, a land of cruelty, a group of capable individuals struggling for survival.