In the evolution of ABM defense from the early NIKE II studies to the present-day SAFEGUARD System, a number of major systems were conceived and developed to meet the ever-changing threat. These systems are discussed in this part of the report and include NIKE-ZEUS, NIKE-X, SENTINEL, and SAFEGUARD. In addition, each principal subsystem used in the SAFEGUARD deployment is described here from its initial research and development to current configuration.
A list of supporting reference documents is provided in Part IV. Additional information detailing SAFEGUARD System performance is given in a Classified Supplement to this report.
The subject areas by chapter are: