starman wrote:

Assuming 'they' is Uncle Sam, I wonder if they got approval from the
NIST or ITU to interfere with WWV?

Not likely.
Assuming this is Uncle, only those with a "need to know" will
know what's going on, and they will know only the fragment of
information needed to do their "part."
The FCC will have gotten the word from the DOD or
(if Los Alamos or Sandia Labs are involved) the DOE
to ignore any complaints and ask no questions.
NIST can gripe but it will go nowhere; there is
no "need" for them to know why the operations are
temporarily messing with them, so they won't be
told anything.