Bottom Line
U.S. spending on defense as a percentage of GDP has varied substantially in the 70 years since the huge military outlays of World War II. Spending increased from post-World War II levels during the Korean War, stayed relatively high during the Cold War and Vietnam War years that followed, began to fall during the 1970s, rose slightly during the Reagan administration, fell during the Clinton years, rose significantly during the last decade, and has now begun to fall again.
The American public's views on military spending have also varied, generally in reaction to these shifts. Americans were most likely to view spending as too high during Vietnam and the 1980s and early '90s, and most likely to view it as too little after the drop in spending in the 1970s and 1990s. Since 2002, Americans' views that the U.S. is spending too much increased concomitant with actual spending increases that followed 9/11 and U.S. involvement in two wars. Now, as the U.S. begins once again to decrease military spending, the public's attitudes are divided. Given these cuts, it would not be unusual if at some point the public once again began to say military spending had dropped too low, potentially making military preparedness a 2016 presidential campaign issue.