Put your current address (California) on your return. It's important that the IRS can contact you if necessary.
Yes, you do need to submit a Form 8898 since you ended "bona fide residence in a U.S. Possession." The form is completed and sent by itself to:
Department of the Treasury
Internal Revenue Service Center
Philadelphia, PA 19255-0549
Your can get form 8890 and its instructions by clicking on these links:
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