zone of observation

observation point / observation post (OP)

grid zone / grid-zone

zone standard time (zone time) (ZST)

killing zone / kill zone

grid zone designation / Grid Zone Designator

grey-zone / grey zone (international relations)

hundred-per-cent zone (one-hundred-per-cent zone)

no-fire zone / no fire zone

flight restriction zone / flight restricted zone (FRZ)

close observation

command-and-observation post

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

hostile observation

infrared night vision observation device

observation aircraft (O; obsn acft)

observation facilities

observation flight

observation patrol

observation satellite

observation slit

supervise the observation of armistice conditions

type of observation

United Nations India-Pakistan Observation Mission (UNIPOM)

United Nations Iraq-Kuwait Observation Mission (UNIKOM)

United Nations Observation Group in Lebanon (UNOGIL)

United Nations Yemen Observation Mission (UNYOM)

SLOCTOP (security, location, communication, targeting, observation, and position improvement)

artillery observation post

bilateral observation

bilateral observation point

bilateral observation posts coordinates

carry out observation