forward observation post observer

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

air observation post observer

observation point / observation post (OP)

forward observation post

forward artillery observation post

forward observer team

Forward Observer System (FOS)

forward observer

artillery forward observer

forward artillery observation point

forward observation

forward observation point

commando forward observation regiment

forward observation unit

artillery forward observation officer

command-and-observation post

artillery observation post

control observation post

amount of command of observation post

antiaircraft observation post

battery observation post

cross-observation post

flash-spotting observation post

fort-observation post

groupment observation post

armored observation post

artillery group observation post

artillery groupment observation post

artillery observation post vehicle

mobile artillery observation post

sound ranging observation post

vehicle-mounted artillery observation post