; and (2) by inserting after the item relating to the eleventh circuit the following: Twelfth Las Vegas, Phoenix, Portland, Seattle. . 7. Location of Twelfth Circuit headquarters The offices of the Circuit Executive of the Twelfth Circuit and the Clerk of the Court of the Twelfth Circuit shall be located in Phoenix, Arizona. 8. Assignment of circuit judges Each circuit judge of the former ninth circuit who is in regular active service and whose official duty station on the day before the effective date of this Act— (1) is in California, Guam, Hawaii, or the Northern Mariana Islands shall be a circuit judge of the new ninth circuit as of that effective date; and (2) is in Alaska, Arizona, Idaho, Montana, Nevada, Oregon, or Washington shall be a circuit judge of the twelfth circuit as of that effective date. 9. Election of assignment by senior judges Each judge who is a senior circuit judge of the former ninth circuit on the day before the effective date of this Act— (1) may elect to be assigned to the new ninth circuit or the twelfth circuit as of that effective date