On page eight of the link I'm providing through the United States Citizenship and Immigration Services, it states (I put the one I'm referring to in bold and made the font size bigger.:

Your Rights and Responsibilities
What you do now as a permanent resident can affect
your ability to become a U.S. citizen later. The process of
becoming a U.S. citizen is called “naturalization.”
As a permanent resident, you have the right to:
• Live and work permanently anywhere in the U.S.
• Apply to become a U.S. citizen once you are eligible.
• Request visas for your husband or wife and unmarried
children to live in the U.S.
• Get Social Security, Supplemental Security Income,
and Medicare benefits, if you are eligible.
• Own property in the U.S.
• Apply for a driver’s license in your state or territory.
• Leave and return to the U.S. under certain conditions.
• Attend public school and college.
• Join certain branches of the U.S. Armed Forces.
• Purchase or own a firearm, as long as there are no state
or local restrictions saying you can’t.
As a permanent resident, it is your responsibility to:
• Obey all federal, state, and local laws.
• Pay federal, state, and local income taxes.
• Register with the Selective Service (U.S. Armed
Forces), if you are a male between ages 18 and 26.
See page 11 for instructions.
• Maintain your immigration status.
• Carry proof of your permanent resident status at all
times.
• Change your address online or provide it in writing
to the Department of Homeland Security (DHS)
within 10 days of each time you move. See page 12
for instructions.
8


http://www.uscis.gov/files/nativedocuments/M-618.pdf