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They are not telling us what digital signals are really being used for... just so you know:
"Military sensing and communication systems operate in challenging electromagnetic environments where very high linear dynamic range is required to detect small target signals obscured by a strong background of interference, jammers, and clutter. The difficulty is compounded by the increasing tendency to require that these same systems also receive over a very broad bandwidth. Given system bandwidth requirements, the dynamic range offered by current electronic systems is far short of what our sensors require."
DARPA was also instrumental in developing machines that pierce our clothes and give crystal-clear images of our naked bodies and ground penetrating radar.
Newer systems of ground penetrating radar are classified, the older systems have been demonstrated on national television — viewers were treated to a black and white x-ray style view of people walking around inside their homes.
"THIS AIN’T NO GAME SHOW!"