French aristocrat who helped train U. S. soldiers at Valley Forge and helped 5 points the American forces secure resources from France. *
George Washington
Benjamin Franklin
Baron von Stueben
Marquis de Lafayette

An informal structure in a bureaucracy would be something like so-called "office politics". where there's a formal structure set up for the organization, but then an informal subculture as well that has a way of organizing the bureaucracy further. this can be positive because it sets up an added degree of organization, albeit informal, within the bureaucracy.