soldiers practice MOUT tactics in the Ojojibara Maneuver Area of Sendai, Japan during an exercise in 2004.
The United States Armed Forces term for urban warfare is UO, an abbreviation for urban operations. The previously used U.S. military term MOUT, an abbreviation for military operations in urban terrain, has been replaced by UO, although the term MOUT Site is still in use.
The British armed forces terms are OBUA (operations in built-up areas), FIBUA (fighting in built-up areas), or sometimes (colloquially) FISH (fighting in someone's house), or FISH and CHIPS (fighting in someone's house and causing havoc in people's streets).
The term FOFO (fighting in fortified objectives) refers to clearing enemy personnel from narrow and entrenched places like bunkers, trenches and strongholds; the dismantling of mines and wires; and the securing of footholds in enemy areas.
Israel Defense Forces calls urban warfare לש"ב (pronounced LASHAB), a Hebrew acronym for warfare on urban terrain. LASHAB in the IDF includes large-scale tactics (such as utilization of heavy armoured personnel carriers, armoured bulldozers, UAVs for intelligence, etc.), CQB training for fighting forces (how a small team of infantry soldiers should fight in close and built spaces). IDF's LASHAB was developed mainly in recent decades, after the 1982 Lebanon War included urban warfare in Beirut and Lebanese villages, and was further developed during the Second Intifada (2000–2005) in which IDF soldiers entered and fought in Palestinian cities, villages and refugee camps. The IDF has a special large and advanced facility for training soldiers and units in urban warfare.