forward observer (FO), forward observation officer; (artillery) observer / spotter

(передовий) корегувальник (вогню) (варіант написання - коригувальник); передовий (артилерійський) спостерігач (ПАС)

artillery forward observation officer

forward observation post observer

artillery spotter

forward artillery observation point

forward artillery observation post

artillery forward observer

field officer (field-grade officer / senior officer)

observation point / observation post (OP)

air observation post observer

gun spotter

gunnery spotter

spotter plane

atom spotter

flash-spotter

spotter helicopter

spotter-director helicopter

spotter-drone

air gun spotter

air gunnery spotter

spotter reconnaissance plane

spotter-tracer round

spotter

forward observation

forward observation point

forward observation post

commando forward observation regiment

forward observation unit

forward observer team

Forward Observer System (FOS)

forward observer

fire observation officer

artillery observation post