Gustave Kateb, known by his codename 'Doc', is a character in Tom Clancy's Rainbow Six series. He is a highly skilled field medic, renowned for his ability to heal and revive teammates during operations. Doc's expertise lies in his use of the Stim Pistol, which administers adrenaline shots to heal allies or himself from a distance. His calm demeanor and dedication to preserving life make him an invaluable asset to the team. Doc's presence on the battlefield ensures that his team can sustain prolonged engagements, providing a tactical advantage in missions.