1girl, adapted_costume, alternate_costume, arms_behind_back, black_hair, covered_navel, flag, green_eyes, grin, hair_ornament, hairclip, japan_maritime_self-defense_force, japan_self-defense_force, japanese_flag, looking_to_the_side, military, one-piece_swimsuit, school_swimsuit, short_hair, simple_background, smile, solo, swimsuit