Lt Col Roftiel Constantine cogently outlines the competitive relationship between the Europe Union and the United States regarding satellite navigation. To buttress his thesis that Galileo, the European Union's navigation satellite system, poses a veritable threat to the global position system, the navigation system of the United States, Colonel Constantine traces the development of the navigation systems, analyzes the threat posed to the United States by Galileo, and delineates precisely the course of action the United States must undertake to protect its "industrial, military, and national security interests."