On November 7, 2007, USCIS announced that a revised Employment Eligibility Verification Form (I-9) is available for use as well as the M-274, Handbook for Employers, Instructions for Completing the Form I-9. Key to the revision is the removal of five documents for proof of both identity and employment eligibility. They include: Certificate of U.S. Citizenship (Form N-560 or N-570), Certificate of Naturalization (Form N-550 or N-570), the old Alien Registration Receipt Card (Form I-151), the Reentry Permit (Form I-327), and the Refugee Travel Document (Form I-571). USCIS "encourages" use of the new form immediately, but indicates that it will not be required until notice is published in the Federal Register.