✔ 最佳答案
No, they are not being used in US military service any more.
They would have been sold or given to overeas markets in a few cases. In most cases, they would be disposed of as excess Gov't equipment.
No special license would be required other than for the frequencies used.
The GRC-106 is just HF radio, so it is just an amateur HF radio if a working one can be found:
http://www.bunkerofdoom.com/mil/106/index.html
VRC-12 and VRC-64 are just the 30-80MHz military FM (VHF) radios.
This frequency range is reserved for military use and not authorized for civilians or amateurs. The frequencies are still used by the military, but with SINCGARS radios.
NONE of these systems include crypto. They are compatible with EXTERNAL encryption devices.