In order to meet the challenge of World War 2, the Medical Department of the United States Army expanded from a service equipped to support a peacetime army of some 200,000 men, based largely in the Zone of the Interior, to one that provided the best of medical and surgical care for more than 8,000,000 American soldiers serving on a war footing on every continent and under the most varied conditions of climate and terrain. The theme of this book is the administrative history of the Army Medical Department in World War 2. It comprises part of the official history of the Army Medical Service published under the direction of the Surgeon General (Administrative or Operational Series).