These volumes have been prepared to provide information on the US Army Research, Development, Test and Evaluation Program for Congressional Committees during the Fiscal Year 1981 hearings. This information is in addition to the testimony given by US Army witnesses. These volumes contain a descriptive summary for each program element to be financed during FY 1981. Descriptive Summaries for projects within the program elements to be financed during FY 1981 for $5.0 million or more appear immediately following the applicable program element. Where there are several items under development within a project, a separate summary has been provided for each item that exceeds $5.0 million during FY 1981. A Test and Evaluation Section is provided for all major weapon systems. There are seventeen major weapon systems descriptive summaries appearing in Volumes II and III.