сигнал свистком
whistle jerk
whistle
whistle buoy
hear bullets whistle through the air
whistle of bullets
cautionary whistle blast
Signal Kit / MK-79 (illumination signal kit)
acknowledgement signal
arm-and-hand signal
audio signal
caution signal
combined signal
command and signal
command signal center
control signal
distress signal (=SOS)
echo (returned signal)
field army signal brigade
flash a signal
forward area signal center
hand signal
hoisting signal flags
jamming signal
main signal center
prearranged signal
pyrotechnic signal
radio alarm signal
radio frequency signal
recognition signal
signal battalion
signal center
signal communication battalion