This is the fourth in a series of reports on research at the Air Force Cambridge Research Laboratories. The report covers a two-year interval, as will succeeding reports in this unclassified series. This report was written primarily for Air Force and DoD managers of research development--and more specifically, for the managers in our Headquarters office, the Office of Aerospace Research. But it is hoped that it will be of interest and value to a much broader audience. To encompass this broader audience and to make the content more meaningful, the report attempts to relate, by means of survey discussion, the programs to the larger scientific field of which they are a part. The work of each of the nine laboratories is discussed separately in chapters with an overall introductory chapter on AFCRL management and logistic activities during the reporting period. (Author).