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Wikipedia definition
1. Artillery observerA military artillery observer or spotter is responsible for directing artillery and mortar fire, mostly at opportunity targets, and may be a Forward Air Controller (FAC) for close air support and spotter for naval gunfire support. Most commonly observers accompany a tank or infantry manouvre unit. More recently a mission controller for an Army Unmanned Air System (UAS) may also act as an artillery observer and some armies use special artillery patrols behind the enemy's forward elements.
Read “Artillery observer” on English Wikipedia
Read “射弾観測” on Japanese Wikipedia
Read “Artillery observer” on DBpedia

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