World War II Vertical Envelopment : 9781249429739 : 18 Sep 2012 : This study traces the development of the United States Army's airborne concept during World War II. More than any other precedent, German airborne operations against Crete influenced the evolution of U.S. Army airborne doctrine, organization and utilization. Consequently, this thesis adopts a comparative perspective, both direct and longitudinal to examine the U.S. and German airborne experiences, with an emphasis on the former. A series of concerns and issues, including doctrine, organization, technology, tactics, and procedures, focus comparative emphasis on the U.S. airborne from 1940 through July 1943. The formative period extended through May 1941, while the expansion years extended into 1943. A major point of departure and comparison is the German invasion of Crete in May 1941, which lent important impetus to U.S. airborne development. Without knowledge of German losses and shortcoming, U.S. planners accepted Cre