On April 16, 2007, USCIS published a final rule amending DHS regulations to permit petitioners to file O and P nonimmigrant petitions up to one year prior to a petitioner's need for an alien's services. This amendment will enable petitioners to file their petitions under normal processing service and secure the services of O or P nonimmigrants well in advance of a scheduled event, competition, or performance. This rule is effective as of May 16, 2007.