What are the requirements for noncitizen nonimmigrants to enter the United States during the COVID-19 pandemic?

What are the requirements for noncitizen nonimmigrants to enter the United States during the COVID-19 pandemic?

As a condition of entering the United States by air, noncitizen nonimmigrants must present proof of being fully vaccinated against COVID-19 before boarding a flight to the United States. The Proclamation excepts certain categories of noncitizen nonimmigrants who are not fully vaccinated.

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