Close quarters combat (CQC) is a tactical concept that involves physical confrontation between several combatants.^[1] It can take place between military units, police and criminals, and other similar actions. In warfare it usually consists of small units or teams engage the enemy with personal weapons at very short range, up to 30 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.

Criminals sometimes use close quarters combat techniques, such as in an armed robbery or jailbreak, but most of the terminology comes from training used to prepare soldiers, police, and other authorities. Therefore, much material relating to close quarters combat is written from the perspective of the authorities who must break into the stronghold where the opposing force (OPFOR) has barricaded itself. Typical examples would be commando operations behind enemy lines and hostage rescues.

Although there is considerable overlap, close quarters combat is not synonymous withurban warfare

, now sometimes known by the military acronyms MOUT (military operations in urban terrain), FIBUA (fighting in built-up areas) or OBUA (Operations in Built Up Areas) in the West. Urban warfare is a much larger field, including logistics and the role of crew-served weapons like heavy machine guns, mortars, and mounted grenade launchers, as well as artillery, armor, and air support. In close quarters combat, the emphasis is on small infantry units using light, compact weapons that one person can carry and use easily in tight spaces, such as carbines, submachine guns, shotguns,pistols