Here is our budget.
* Mandatory spending: $1.527 trillion (+4.2%)
o $608 billion (+4.5%) - Social Security
o $386 billion (+5.2%) - Medicare
o $209 billion (+5.6%) - Medicaid and the State Children’s Health Insurance Program (SCHIP)
o $324.0 billion (+1.8%) - Unemployment/Welfare/Other mandatory spending
* Discretionary spending: $1.114 trillion (+3.1%)
o $481.4 billion (+12.1%) - United States Department of Defense
o $145.2 billion (+45.8%) - Global War on Terror
o $69.3 billion (+0.3%) - Health and Human Services
o $56.0 billion (+0.0%) - United States Department of Education
o $39.4 billion (+18.7%) - United States Department of Veterans Affairs
o $35.2 billion (+1.4%) - US Department of Housing and Urban Development
o $35.0 billion (+22.0%) - State and Other International Programs
o $34.3 billion (+7.2%) - Department of Homeland Security
o $24.3 billion (+6.6%) - Energy
o $20.2 billion (+4.1%) - Administration of justice
o $20.2 billion (+3.1%) - Department of Agriculture
o $17.3 billion (+6.8%) - National Aeronautics and Space Administration
o $12.1 billion (+13.1%) - Department of Transportation
o $12.1 billion (+6.1%) - Department of Treasury
o $10.6 billion (+2.9%) - United States Department of the Interior
o $10.6 billion (-9.4%) - United States Department of Labor
o $51.8 billion (+9.7%) - Other On-budget Discretionary Spending
o $39.0 billion - Other Off-budget Discretionary Spending
* Net interest on debt: $261 billion (+9.2%)
The Iraq war and the Afghanistan war are not part of the defense budget; they are appropriations.
It is small relative to the others, but it is not small per se.
As President, that is an area where he could have some direct control over spending by closing unneeded bases (like we have done in the States) and use that savings to transition us out of the Welfare state.