“To say Impossible Iron Man is canon is perfect. But the idea is that XCOM never made it out of conventional weapons that the aliens came in overwhelming force and overwhelming numbers,” he said. “We've all had our losses with XCOM, and so we use kind of a light touch. “The specifics of the canon version of the short war are intentionally left vague, so as not to trample on each of our individual stories of the time (or many, many times) our squads valiantly failed to fend off the invasion.