The following pie chart illustrates total federal spending for fiscal year 2006. Fiscal year 2006 runs from October 1, 2005 to September 30, 2006.
The 'national defense' portion of the budget includes some, but not all money for the wars in Iraq and Afghanistan. As of April, 2006, Congress was debating legislation which would allocate about $65 billion more for the military in budget authority, most or all of which will be spent in fiscal year 2006, increasing the national defense share of the pie.
Source: Office of Management and Budget, Budget of the U.S. Government, FY2007. [1]
Links:
[1] http://www.whitehouse.gov/omb/budget