For that indicator, The Stockholm International Peace Research Institute provides data for the USA from 2010 to 2012. The average value for the USA during that period was 687573.67 million U.S. dollars (constant 2011 prices) with a minumum of 668841 million U.S. dollars (constant 2011 prices) in 2011 and a maximum of 711402 million U.S. dollars (constant 2011 prices) in 2010.
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The entire data set can be obtained at sipri data.
Definition: Military spending includes expenditure on peacekeeping, defense ministries, paramilitary forces, and military space activities. Also: military and civil personnel, including retirement pensions; operations and maintenance; procurement; military research and development; and military aid. Defense and current expenditure for past military activities, such as for veterans' benefits, demobilization, conversion, and weapon destruction, are not included.