For international travel...yes. you do NOT need it for travel in the continental US for certain. Not sure about Alaska and Hawaii though.
Maybe if you are traveling Internationaly, but I dought they will if you are an American Citezen!
You need a Neg to enter the US. Each country has its own requirements.
To travel you must have been tested for covid or have a vaccination card for proof that you are vaccinated.
I believe you should because if not could be a problem
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