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 etablerede et forbindelseskontor i Washington, D.C., men opslog sit midlertidige hovedkvarter på 18. sal af 270 Broadway i New York, hvor han kunne trække på administrativ støtte fra ingeniørkorpsets nordatlantiske division.