forward observation unit

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

observation point / observation post (OP)

forward artillery observation point

forward observation

forward observation point

forward observation post

forward observation post observer

commando forward observation regiment

forward artillery observation post

artillery forward observation officer

artillery observation unit

special observation unit

forward interpretation unit

battery coolant unit / battery-coolant unit (BCU)

gear reduction unit / gear-reduction unit

position and navigation unit / position navigation unit (PNU)

pinch (a unit) out of a large unit

close observation

command-and-observation post

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)