What fake title was used to hide the filming of "Return of the Jedi"?

In Hollywood, secrecy is an art form. When filming the final chapter of the original Star Wars trilogy, LucasFilm needed a way to throw off rabid fans and keep costs from skyrocketing. Their solution? Give their blockbuster-in-waiting a completely different identity. So what was the fake title used to disguise "Return of the Jedi"?

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