Many modern aircraft, missiles, and artillery require detailed information about the earth to guide them to target. This "earth data" is also necessary for training those who will man the aircraft, launch the missiles, and fire the artillery. According to Jay Larson and George Pelletiere, however, inadequate data now mars the early, critical stages of weapons development and acquisition. In this challenging study, the authors catalog a history of bureaucratic omissions, contradictions, and funding disputes that have hampered earth data programs. Larson and Pelletiere recommend system improvements under the general aegis of the Department of Defense, with the Defense Mapping Agency taking a leading role. They suggest specific ways to clarify existing regulations, standardize earth data products, identify earth data requirements early in the weapons acquisition process, and adequately fund development. Some will find this book controversial, but no responsible reader will find its argument less than coherent nor its revelations less than sobering. The authors' insights may well point the way for better use of new technology in the service of national security. Bradley C. Hosmer Lieutenant General, USAF President, NDU