Navy just made an excellent point on another thread (linked) which I thought was worth it's own OP.
In it, he indicates certain responsibilities that permanent residents have. He quotes from Wiki, but I thought I should support them with a paragraph printed on the 2 page letter that I received along with my own Permanent Resident card:
Any legal permanent resident knows that they have to carry their card with them in the United States and produce it when requested to do so. No permanent resident has any right to object to such a request.
http://www.usmessageboard.com/immigration-illegal-immigration/115144-mexico-migrants-face-human-rights-crisis-says-amnesty.html#post2254587
In it, he indicates certain responsibilities that permanent residents have. He quotes from Wiki, but I thought I should support them with a paragraph printed on the 2 page letter that I received along with my own Permanent Resident card:
Additional Information About Your Card
USCIS issues several different kinds of cards for different purposes. Please read how to use your card. Always carry your card in the United States and show it when you reenter the United States. Please keep this information for your future reference.
Any legal permanent resident knows that they have to carry their card with them in the United States and produce it when requested to do so. No permanent resident has any right to object to such a request.
http://www.usmessageboard.com/immigration-illegal-immigration/115144-mexico-migrants-face-human-rights-crisis-says-amnesty.html#post2254587