Not half. Rather it's the mandatory spending that takes up more than half of the budget (2010).
Mandatory Spending: $2.173 trillion for Social Security, Unemployment/Welfare, Medicare, Medicaid and Interest to be paid on the National Debt.
Discretionary Spending: $1.378 trillion for Dept of Defense (including Overseas Contingency Operations), Dept of Health and Human Services, Dept of Transportation, Dept of Veterans Affairs, Dept of State and Other International Programs, Dept of Housing and Urban Development, Dept of Education, Dept of Homeland Security, Dept of Energy, Dept of Agriculture, Dept of Justice, NASA, Dept of Commerce, Dept of Labor, Dept of the Treasury, Dept of the Interior, EPA, SSA, National Science Foundation, Corps of Engineers, National Infrastructure Bank, Corporation for National and Community Service, Small Business Administration, General Services Administration, Troubled Asset Relief Program (TARP), Financial stabilization efforts, Potential disaster costs, Other Agencies, and "Others."
http://www.gpoaccess.gov/usbudget/fy10/pdf/fy10-newera.pdf
48.1% ($664 billion) of the
Discretionary Spending ($1.378 trillion) went to the Dept of Defense while the rest (51.9%) of the discretionary money went toward to the rest of the departments, other agencies and other programs.
But, a little of $2 trillion dollars went to the Social Security Administration, Unemployment/Welfare, Medicare, and Medicare as part of the
Mandatory Spending.
It's incorrect that the military gets over half of our budget. At least have the temerity to provide the numbers than just saying it.