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landing zone
In military terminology a landing zone (LZ) is an area where aircraft can land.
In the United States military, a landing zone is the actual point where aircraft, especially helicopters, land (equivalent to the commonwealth landing point.)
In commonwealth militaries, a landing zone is the cartographic (numeric) zone in which the landing is going to take place (e.g., a valley). The landing area is the area in which the landing is going to take place (e.g., the field where the aircraft are to land). The landing point is the point on which aircraft are going to land (e.g., a point of the field). Each aircraft has a different landing point.
==Identifying an LZ from the air==
Landing areas are most commonly marked by coloured smoke. The standard procedure is for troops already on the ground at the landing area to "pop smoke" (set off a smoke grenade). The aircraft pilot(s) radio back when the smoke is spotted and what colour smoke they see. Troops on the ground then respond with what colour the smoke should be. Smoke of a different colour can mean that the landing area has been discovered and compromised by the enemy, and the pilot will usually have the authority to cancel any landing.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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