echo (returned signal)

echo location/echo ranging

army returned vehicle park

bottom echo signal

Signal Kit / MK-79 (illumination signal kit)

E – ECHO

echo depth finder

echo sounder

echo sounding

bottom echo

coherent echo

coherent echo modulation and detection

Doppler echo indicator

echo area

echo frequency

echo intensity

mirror-reflection echo

precipitation echo

second-trip echo

echo

Echo (phonetic alphabet)

target echo

skin echo

acknowledgement signal

arm-and-hand signal

audio signal

caution signal

combined signal

command and signal

command signal center

control signal

distress signal (=SOS)

field army signal brigade