First published in 1973. From the preface: "The purpose of this study is to trace the evolution of airmobility in the U.S. Army. The integration of aircraft into the organic structure of the ground forces is as radical a change as the move from the horse to the truck, and the process is only beginning. Because this change is not the product of one man or one small group of men but rather a fortunate confluence of technology, tactics, and imagination, proper credit to every responsible individual is impossible. I have tried to identify some of those people who made a major contribution throughout the years. Although Vietnam was the first large combat test of airmobility, air assault operations in Southeast Asia would not have been possible without certain key decisions a decade earlier. This study attempts to trace the most important milestones which led to the eventual formation of airmobile divisions".