artillery groupment observation post

groupment observation post

groupment command post

observation point / observation post (OP)

artillery observation post

artillery group observation post

artillery observation post vehicle

forward artillery observation post

mobile artillery observation post

vehicle-mounted artillery observation post

command-and-observation post

control observation post

air observation post observer

amount of command of observation post

antiaircraft observation post

battery observation post

cross-observation post

flash-spotting observation post

fort-observation post

forward observation post

forward observation post observer

armored observation post

sound ranging observation post

air observation post

air observation post flight

air observation post squadron

command p.-observation post

scientific observation post

aiming post lamp / aiming post light

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

artillery observation unit

field artillery observation battalion

forward artillery observation point