In this 1991 volume, the 20 most critical technologies considered to be key to improving America's defense capabilities into the 21st century are identified. Led by Senior Dean and Scientific Advisor J.S. Przemieniecki, the Air Force Institute of Technology's team of experts put together this important book for everyone involved in defense research and development. Each of the 20 critical technologies is examined in-depth, including physical and engineering principles. A full description of the technology and its projected impact on future weapon systems is provided.