Close-quarters battle

Close-quarters battle is combat between armed personnel at very short range, usually inside buildings or other confined spaces. It is shaped by limited visibility, rapid encounters, and restricted movement.

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Room clearing: A coordinated method for entering and searching a room where hostile threats may be present. It is a defining task in building combat, where thresholds and limited sightlines shape movement.
Military tactics: The methods armed forces use to organize and direct action during engagements. Close-quarters methods are a specialized part of the broader practice of tactics.
Military urbanism: The study and practice of military operations shaped by urban environments. It examines how city infrastructure and built space influence close-range engagements.
Close combat: Physical fighting at short range, with or without weapons. This broader category includes forms of fighting that do not involve armed teams in confined spaces.
Close-quarters battle tactics: Methods for coordinating movement, observation, and action during combat at very short range. These tactics address the compressed time and space that distinguish this kind of fighting.
Interior architecture: The design and organization of enclosed spaces within buildings. Room layouts, doorways, and corridors directly shape movement and visibility.
Hostage rescue: An operation to recover people held captive, often under threat of violence. Rescue operations may require armed teams to act in confined spaces while protecting captives.
Hand-to-hand combat: Physical combat in which opponents fight without using ranged weapons. Close-quarters battle can involve firearms and coordinated teams rather than unarmed physical fighting.
Situational awareness: The perception and understanding of relevant conditions and events in an environment. Rapidly changing positions and incomplete information make awareness difficult to maintain.
Ballistics: The science of projectile motion and the effects of projectiles on their targets. Short distances and intervening walls affect projectile behavior and danger to others.