Traces the usage of- and meaning given to- the terms "roles and missions" relating to the armed forces and particularly to the United States Air Force, from 1907 to the present.

The twentieth century witnessed the emergence of three-dimensionality in war: surface forces flow became prey for attackers operating above and below the earth and its oceans. The aerial weapon, prophesied for centuries, became a reality, as did air power projection forces. This insightful book by Warren A. Trest traces the doctrinal underpinnings of the modern United States Air Force, the world's only global air force. We the men and women who serve in the Air Force, but also our fellow airmen in America's other military services are the heirs and beneficiaries of a long heritage of doctrinal development and military thought. Our predecessors pursued a vision of airborne global reach and power that often put them at odds with those who could not break free of the confines of conventional thought and lock-step traditionalism. Fortunately, they had the courage of their convictions and the faith in their vision to continue to pursue the goal of global air power despite such resistance. Today, America is a genuine aerospace power, and that pioneering vision dating to the days of the Wright brothers, has expanded to encompass operations in space and between the mediums of air and space. As we approach the new millennium, it is well to ponder the lessons and the history of how a small group of truly gifted airmen transformed their nation's military establishment, and, in so doing, the world around them.

This edited volume examines the recalibration of the People’s Liberation Army’s (PLA) roles and missions in China’s domestic and foreign policymaking since Xi Jinping’s ascension to power in late 2012. This book explores how China’s growing military prowess, along with Beijing’s ongoing shift away from "keeping a low profile," owes much to the policies of the China’s Communist Party under Xi Jinping’s leadership. The chapters in the book share a central theme: the recalibration of the PLA roles and missions since Xi Jinping assumed the trifecta of party-state-military power. These contributions seek to explore in depth some of the key issues and scrutinize the enhancements in the PLA’s operational capabilities, both in terms of its hardware as well as its "heartware" – the human elements of its development such as operational culture and doctrine. In all, the chapters document the transformative change the PLA has undergone since the profound realization of its previous limitations vis-à-vis the United States’ advanced military operations of the previous century as well as pointing to continuity amid change. This book will be of much interest to students of strategic studies, Chinese politics, Asian security, defense studies, and international relations, in general.

Principal Investigator-Led (PI-led) missions are an important element of NASA's space science enterprise. While several NRC studies have considered aspects of PI-led missions in the course of other studies for NASA, issues facing the PI-led missions in general have not been subject to much analysis in those studies. Nevertheless, these issues are raising increasingly important questions for NASA, and it requested the NRC to explore them as they currently affect PI-led missions. Among the issues NASA asked to have examined were those concerning cost and scheduling, the selection process, relationships among PI-led team members, and opportunities for knowledge transfer to new PIs. This report provides a discussion of the evolution and current status of the PIled mission concept, the ways in which certain practices have affected its performance, and the steps that can carry it successfully into the future. The study was done in collaboration with the National Academy of Public Administration.