In order to travel back to the US, you’ll need proof of your LPR status (i.e., your green card status). The I-551 stamp placed in your passport upon your initial arrival in the US serves as a temporary green card for a 1-year period. If you’ll be out of the US for more than 1 year, you’ll need to apply for a reentry permit BEFORE leaving the US.
Edward Weiner
Attorney at Law
E-mail: E.Weiner@immigration-aux-usa.com
Internet Site:
http://www.immigration-aux-usa.com/