Research & Development, Descriptive Summaries include narrative information on Research, Development, Test and Evaluation (RDT&E) Programs and Program Elements (PE Numbers) within the Department of Defense. Another common name associated with RDDS data is PEDS (Program Element Descriptive Summaries). The Defense Technical Information Center maintains a searchable database of PEDS that includes many but not all of these program budget documents.
The Department of the Navy also has an extremely nice implementation of the FY 1998/FY 1999 Biennial Budget Estimates