спостереження з аеростата
observation balloon
observation point / observation post (OP)
barrage balloon
balloon bed
balloon tire
balloon wing
balloon-launched aeroballistic
ballonet balloon
balloon
balloon envelope
balloon probe
balloon sounding
captive balloon
constant-level balloon
dirigible balloon
free balloon
pilot balloon
radiosonde balloon
target balloon
captive balloon-borne communication
radar decoy balloon
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 helicopter
observation mission
observation patrol