forward artillery observation point

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

forward artillery observation post

artillery forward observation officer

observation point / observation post (OP)

forward observation point

forward observation

forward observation post

forward observation post observer

commando forward observation regiment

forward observation unit

artillery observation post

artillery observation unit

field artillery observation battalion

anti-aircraft artillery observation aircraft

artillery group observation post

artillery groupment observation post

artillery instrumental observation

artillery observation

artillery observation aeroplane

artillery observation aircraft

artillery observation helicopter

artillery observation plane

artillery observation post vehicle

artillery observation tank

artillery observation tower

artillery observation vehicle

artillery reconnaissance and observation

mobile artillery observation post

vehicle-mounted artillery observation post

artillery forward observer

bilateral observation point

key observation point