The military radios in the US armed forces commonly use encryption and the frequency hopping methods provide an additional layer of security during transmission of the encrypted signal. An example of a frequency-hopping field VHF/FM transceiver used by US Special Forces would be the Caracal RPM 4740 manufactured by Thales Communications
of France.
From
http://www.aeronautics.ru/news/news002/news071.htm
Send back them freedom transceivers back to France
