 Organizers and participants in the simulation also include members of the U.S. Army, Navy, Marine Corps, and Air Force, from multiple institutions including the continuing involvement of the United States Army War College.Since the inception of Simulex, Professor Robert Pfaltzgraff has designed the scenarios, which typically reflect contemporary tensions and developments.Notably, Simulex 1989 scenario envisioned the fall of the Berlin Wall, which was played one week before the actual event.