(13. Answer: scheduled foot, scheduled motor, scheduled air, special
foot, special motor, special air)
14. The main advantages of messenger as a means are ______________________________ ,
______________________ , and ______________________ .
(14. Answer: security, reliability, flexibility)
15. You can use sound to attract attention, transmit prearranged messages,
and spread alarms. You may even send messages in international Horse code
by the ____________________ signals these devices generate. Devices commonly used
in communicating with sound include: horns, sirens, bells, whistles, voice
amplifiers, and explosives.
(15. Answer: sound)
16. Name six devices employed for sound communications.
______________________
____________________
______________________
____________________
______________________
____________________
______________________
____________________
(16. Answer: horns, whistles, sirens, bells, voice amplifiers,
17. When using sound to communicate, you must keep messages short and
simple. Battle noise reduces the effectiveness of sound signals. Such sig-
nals are good only for relatively (short/long) distances, and are vulnerable
to enemy interception.
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