FMF Combat Communications 3

Question 1

What frequency range is typically associated with VHF (Very High Frequency) communications?

Accepted Answer

30–300 MHz

Answer

VHF communications operate in the 30–300 MHz range, and are commonly used for short-range tactical communications in the Marine Corps.

Question 2

Which of the following best describes 'frequency hopping' in secure radio communications?

Accepted Answer

Rapidly switching transmission frequencies in a pre-determined pseudo-random sequence to prevent jamming and interception

Answer

Frequency hopping spreads transmissions across many frequencies in a synchronized pseudo-random pattern, making it extremely difficult for adversaries to intercept or jam.

Question 3

What does the proword 'BREAK' indicate when used in voice communications?

Accepted Answer

A separation between portions of the message, especially between the address and the text

Answer

'BREAK' is used to indicate a separation between portions of a message, most commonly between the address group and the text, to improve clarity.

Question 4

In what situation would a Marine use a 'relay station' for communications?

Accepted Answer

When terrain or distance prevents two stations from communicating directly

Answer

A relay station is used when terrain masking or excessive distance prevents two stations from achieving direct radio contact, allowing a third station to pass traffic between them.

Question 5

What is the correct format for a standard military grid reference used in communication messages?

Accepted Answer

A six-, eight-, or ten-digit grid reference based on the Military Grid Reference System (MGRS)

Answer

MGRS grid references provide a standardized, concise way to communicate locations on military maps using six, eight, or ten digits for varying levels of precision.

(FMF) Fleet Marine Force Practice Test

(FMF) Fleet Marine Force Practice Test

FMF Combat Communications 3