cross-observation post

observation point / observation post (OP)

cross-observation base

frame cross member / frame cross-member

echoing cross-section; echoing cross section

radar cross-section / radar cross section (RCS); radar signature; radar crossover

command-and-observation post

artillery observation post

control observation post

air observation post observer

amount of command of observation post

antiaircraft observation post

battery observation post

flash-spotting observation post

fort-observation post

forward observation post

forward observation post observer

groupment observation post

armored observation post

artillery group observation post

artillery groupment observation post

artillery observation post vehicle

forward artillery observation post

mobile artillery observation post

sound ranging observation post

vehicle-mounted artillery 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

close observation