Border Patrol Travel Documents, Part 13
A reentry permit, form
I-327, is issued to a permanent resident alien in lieu of a passport.
The reentry permit guarantees them permission to reenter the US
and is valid for a period of 2 years. It is not renewable.
The reentry permit
contains a digitized photograph and many of the security features
of a passport. Visas and entry / exit stamps may be applied to
the blank pages.