Landing Zone
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A Landing Zone or "LZ" is a military term for any area where aircraft land.
In the American military a landing zone is the actual point where aircraft 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, (i.e. the valley.) Landing area is the area in which the landing is going to take place (i.e. the field where the aircraft are to land.) Landing point is the actual point on which aircraft are going to land (i.e. a point of the field.) Each aircraft has a different landing point.
Landing areas are most commonly marked by coloured smoke. The standard procedure is for those at the landing area to pop smoke and say so over the radio. The pilot says when smoke is seen and what colour the smoke is. Those on the ground then respond with what colour the smoke should be. Smoke of a different colour can mean the landing area has been compromised, and the pilot usually has the authority to cancel a landing.