She's one adorable admiral. Though I recall in another comic she doesn't like being called Phoenix.
Updated
*shake shake*I and Tone-nee-san will undertake the duty of Admiral Hibiki's assistants.Phoenix...It's Admiral Phoenix.If you need a consult, I shall listen... Admiral Hibiki.UnapprovedAdmiral Hibiki! Leave the battle records up to onee-san, okay♪*shake shake*Yes! It is fine to leave it to us! Admiral Hibiki!