The Third Unit is lead by the Third Commander, Shayuu, and all members of the Unit answer to him. They act together during crisis, combat, training, and so on. Members of the Third Unit may either volunteer, become chosen by Shayuu, or become assigned to the Unit by the request of Nero, the Leader, or another Commander, although the member may decline the selection or request.
As Shayuu is not only a Commander, but the lead Doctor within the Celestial Heavens, many of the members of the Third Unit have some talent or connection to healing, either being doctors or medics, themselves, as well, or being especially familiar with the herbs and medicines they use.