This document has been prepared to provide information on the United States Air Force (USAF) Research, Development, Test an Evaluation (RDT&E) program to Congressional Committees during the Fiscal Year 1981 hearings. This information is in addition to the testimony given by DoD witnesses. A descriptive Summary is provided for each program element within the USAF FY 1981 RDT&E program. Also included are Descriptive Summaries of projects requiring $5 million or more within an element in FY 1981. A Test and Evaluation section is provided for major weapon systems. The 'Resources' portion of the Descriptive Summaries includes, in addition to RDT&E funds, procurement funds and quantities, Military Construction Appropriation funds on specific development programs, and where applicable, Department of Energy (DoE) costs.