What is Re-entry Permit?
Re-entry Permit meaning A travel document that DHS issues to lawful permanent residents (LPRs) who want to stay outside of the United States for more than one year and less than two years. LPRs who cannot get a passport from their country of nationality can also apply for a re-entry permit. You can put visas for foreign countries in a re-entry permit.
reference: U.S. Visas – Glossary