Veterans' Service Records: This site from the National Archives provides resources for researching and requesting military records.
Research, Center for Minority Veterans: This site provides research data and resources specifically towards veterans who are also minorities.
Veterans: This site from the Census Bureau collects data and reports focused on veterans as a population. Some data and reports also subdivide (e.g. women veterans).
National Center for Veterans Analysis and Statistics: This site from the U.S. Department of Veterans Affairs collects several sources of research and data related to veterans.
Veterans and Military Families: This site from the Substance Abuse and Mental Health Services Administration provides research and data on topics such as substance abuse and PTSD.
Defense POW/MIA Accounting Agency: This site provides information on POW/MIA servicemembers from World War II to present.