Risky Missions Of Forward Observer - World Documentary Films HD.

A military artillery observer or spotter is responsible for directing artillery and mortar fire, mostly at opportunity targets[citation needed], and may be a Forward Air Controller (FAC) for close air support and spotter for naval gunfire support. Also known as "Forward Observer", "Fire Support Specialist", or "Fister". 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[citation needed] and some armies use special artillery patrols behind the enemy's forward elements.

Source: https://en.wikipedia.org/wiki/Artille...