You can come back freely because of "automatically visa revalidation program" (not exactly words, but same meaning", which allows you to visit Canada, Mexico and some other places and come back with your current I-94 and legal status within 15 to 30days (depends on the place you visit) without a valid physical visa stamp.
Only exemption is if you apply a new visa in the US consulate in those countries, that will void your visa auto revalidation, no matter you get a visa or not. If not, you have to go back to your home country directly.
Only exemption is if you apply a new visa in the US consulate in those countries, that will void your visa auto revalidation, no matter you get a visa or not. If not, you have to go back to your home country directly.
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