Basic Statistics

• Military Expenditures as % of GDP by Country / United Nations Development Program
• Statistical Abstract - National Security and Veterans Affairs Section / United States Bureau of the Census

Databases

• WDI Online / World Bank Group
  WDI Online provides statistics on military expenditure (% of central government expenditure), military expenditure (% of gdp), military expenditure (current local currency unit), military personnel (% of total labor force), and military personnel.

Online Publications

• Annual Report on Military Expenditures by Country / United States Department of State
• World Military Expenditures & Arms Transfers / Bureau of Arms Control, United States Department of State
• World Factbook / Central Intelligence Agency
  Published annually, this brief guide profiles the economy, government, land, demographics, communications, and national defense establishments of 191 nations and other political entities. Prior years may be accessed via the guide World Factbook. Tables of data items in each country's profile can be viewed from the Notes and Definitions link. Click on the term being defined and a table for all countries will appear.