Marshall created a liaison office in Washington, D.C., but established his temporary headquarters on the 18th floor of 270 Broadway in New York, where he could draw on administrative support from the Corps of Engineers' North Atlantic Division.
Marshall creou unha oficina de enlace en Washington, D.C., aínda que estableceu o seu cuartel xeral no 18º piso da Torre 270 en Nova York, dende onde podía tomar apoio administrativo da División Atlántico Norte do Corpo de Enxeñeiros.