The Department of Health and Human Services (primarily the National Institutes of Health, or NIH) accounts for most federal support for research and chiefly in the life sciences, while the Department of Defense (DoD) accounts for much of the federal research investment in engineering.
SOURCE: Appendix Table 4-31, Science and Engineering Indicators 2008, National Science Foundation, http://www.nsf.gov/statistics/seind08.
Figure 6. U.S. federal research investment by selected agency and S&E field: FY2007
DIGEST OF KEY SCIENCE AND ENGINEERING INDICATORS 2008 – General Science and Engineering Indicators