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2-years is the mark where you can start being able to receive an "Approve" or "Accept" recommendation... in my experience a Refer usually happens for 2-4 years after a foreclosure notation depending on the person's credit profile.
Not sure if you've came across this, but it's Fannie Mae's manual for running DU on VA mortgages.
https://www.efanniemae.com/sf/guides/duguides/pdf/vaduug.pdf