Close quarters combat (CQC) is a tactical concept that involves physical confrontation between several combatants. It can take place between military units, police/corrections and criminals, and other similar scenarios. In warfare, it usually consists of small units or teams engaging the enemy with personal weapons at very short range, up to 100 meters, from proximity hand-to-hand combat to close-quarter target negotiation with short-range firearms. In the typical close quarters combat scenario, the attackers try a very fast, violent takeover of a vehicle or structure controlled by the defenders, who usually have no easy way to withdraw. Because enemies, hostages/civilians, and fellow operators can be closely intermingled, close quarters combat demands a rapid assault and a precise application of lethal force. The operators need great proficiency with their weapons, and the ability to make split-second decisions in order to minimize accidental casualties.