Who is Domingo Chavez from Rainbow Six and what is their importance?

Domingo Chavez (Ding) is a former CIA agent who has been named to head Team 2, Rainbow, reporting to John Clark. Ding is Latino and originally from East L.A. He is small in stature but makes up for his size in tenacity and dedication. Ding is a tough, demanding leader, who is well liked and respected by his men. Ding is married to John Clark's daughter, Patsy, who is a doctor and has accompanied him to England. Patsy is pregnant with their first child and works as an emergency room doctor at the same hospital as her mother.