Major Prepper radio and Pc comms threat for US community

[Paul]

including the authority to amend, modify, or revoke such assignments, in those parts of the electromagnetic spectrum assigned to the Federal Government;

Am I reading this wrong or is this saying that a government body can at will revoke access to the airways?

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including the authority to amend, modify, or revoke such assignments, in those parts of the electromagnetic spectrum assigned to the Federal Government;

Am I reading this wrong or is this saying that a government body can at will revoke access to the airways?

If they so desire.