fire observation officer

field officer (field-grade officer / senior officer)

observation point / observation post (OP)

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

artillery forward observation officer

slant fire; diagonal fire; oblique fire; fire to the oblique

non-commissioned officer (NCO) / noncomissioned officer

observation and fields of fire

observation and fields of fire, avenues of approach, key and decisive terrain,obstacles, and cover and concealment (OAKOC)

fire control orders (FCO) ('Hold Fire', 'Cease Fire' and 'Engage')

selector lever, fire selector, fire switch, fire selector switch

fire support officer (FSO)

fire support non-commissioned officer

fire prevention officer

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)

United Nations Yemen Observation Mission (UNYOM)

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

artillery observation post

bilateral observation