It depends. I assume he is a US citizen and does not have a legal residence in another state?
If that is the case, and Virginia is the place he receives mail, comes home to when he's not working, holds a VA drivers license, VA bank accounts, etc, then Virginia would be his state of residence.
Please note in this excerpt from tax.virginia.gov explains that if they were a Virginia Resident and are simply working outside Virginia, they are still Virginia residents unless they give up their Virginia residency:
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