This is a requirement to unlock Phase 3, but can be done right after finishing Phase 1. As it uses the same fleet as Phase 1, it is more convenient to do it after clearing Phase 1.
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In addition to clearing Phase 2, Node {{MapRoute|M|red}} must be S ranked to unlock Phase 3. This step can be done at any point, right after clearing Phase 1. As it can use the same fleet as Phase 1, it is more convenient to do it after clearing Phase 1.
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* [[#Phase 1|Phase 1]]'s fleet
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* [[#Phase 1|Phase 1]] or [[#Phase 2|Phase 2]]'s fleet