More than half of all U.S. federal R&D investment is spent in support of defense, although investment in space research and in general sciences has grown more recently.
Figure 5. Federal R&D budget authority by budget function: FY 1980-2008
SOURCE: Appendix Table 4-26, Science and Engineering Indicators 2008, National Science Foundation, http://www.nsf.gov/statistics/seind08.
DIGEST OF KEY SCIENCE AND ENGINEERING INDICATORS 2008 – General Science and Engineering Indicators