"The purpose of this reference text is to provide information about space systems and their use as they relate to U.S. Army and joint military operations. The intended primary users are U.S. Army Command and General Staff College students, although military commanders, staff officers, Noncommissioned Officers, and instructors may also find it useful. Military space operations are truly joint in their nature. Therefore, there are extensive references to policies, programs, operations and applications from many U.S. Government organizations, the military services, and commercial entities. The format and contents are intended to provide the reader with a central reference as to the environment of space, the capabilities and limitations of U.S. satellite systems, space applications that support the military strategic, operational and tactical levels, and space support planning considerations. In addition, the text provides a cursory background in space history, space policy, orbital mechanics, and threats to U.S. dominance of space."