If you are a lawful permanent resident and will be outside of the U.S. for more than a year, you will need to make special preparations for your re-entry before you leave the U.S. If you have applied to adjust to permanent resident status, you should be careful of any trip outside the U.S. The U.S. Customs and Border Protection (“CBP”) officers at airports have become increasingly probing about Green Card abandonment. If a trip outside the U.S. is anything more than short, you may need to demonstrate your ties to the U.S. to the CBP official at the port of entry, 

Reentry Permit is suitable for lawful permanent residents or conditional permanent residents who wish to remain outside the United States for more than one year, and for lawful permanent residents who want to travel outside the United States, but cannot get a passport from their country of nationality.