That is not clear to me.  I have seen in multiple news stories that ships are allowed to lift masking requirements if 95% of passengers and crew are vaccinated.  However, from what I can see in the CDC documents you would have to meet the Vaccine Standard of Excellence to be exempt from masking.  Someone did point out some verbiage about 'discretion' so maybe the CDC is using that discretion to not require masks for Highly Vaccinated ships at this point.
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