The rigid combustion form of G&D needs to be obtained with American quality G&D, because the rigid combustion form is bound to the heroic form. As long as you get the G&D in heroic form and then advance to 3, you can unlock the rigid combustion form.

197 1 The Returning Altman, a new hero who appeared after four years of stagnation, was originally named Returning Altman (Xinman).