Multiple passports?

If I apply for a new one now, and then apply for a another one once the gov starts RFID-enabling them, will the first one be invalidated? Or can I have two passports, the one without RFID to use, and the one with RFID to play with? -- The six phases of a project: I. Enthusiasm. IV. Search for the Guilty. II. Disillusionment. V. Punishment of the Innocent. III. Panic. VI. Praise & Honor for the Nonparticipants.