Gustave Kateb aka “Doc” is a defensive operator for the French CTU; GIGN. He has the stim pistol ability which gives him or his teammates a boost of adrenaline. His ability can be used to revive or heal teammates or himself. The boost gives an extra 40 health, and revives you to 75 health. The developers had to use video game engineering to get physics, and drop right with his stim pistol ablility.