US defense budget

The military budget is the portion of the discretionary United States federal budget allocated to the Department of Defense, or more broadly, the portion of the budget that goes to any military-related expenditures. The military budget pays the salaries, training, and health care of uniformed and civilian personnel, maintains arms, equipment and facilities, funds operations, and develops and buys new items. The budget funds four branches of the U.S. military: the Army, Marine Corps, Navy, and Air Force. In FY 2015, Pentagon and related spending totaled $598 billion, about 54% of the fiscal year 2015 U.S. discretionary budget. For FY 2017, President Obama proposed the base budget of $523.9 billion, which includes an increase of $2.2 billion over the FY 2016 enacted budget of $521.7 billion.

For the period 2010-14, SIPRI found that the United States was the world's biggest exporter of major arms, accounting for 31 percent of global shares, followed by Russia with 27 percent. The USA delivered weapons to at least 94 recipients. The United States was also the world's eighth largest importer of major military equipment for the same period. The main imports were 19 transport aircraft from Italy; and equipment produced in the US under license—including 252 trainer aircraft of Swiss design, 223 light helicopters of German design and 10 maritime patrol aircraft of Spanish design.

The following is historical spending on defense from 1996-2015, spending for 2014-15 is estimated. The Defense Budget is shown in billions of dollars and total budget in trillions of dollars. The percentage of the total U.S. budget spent on defense is indicated in the third row, and change in defense spending from the previous year in the final row.

For the 2011 fiscal year, the president's base budget for the Department of Defense and spending on "overseas contingency operations" combine to bring the sum to US$664.84 billion.

When the budget was signed into law on 28 October 2009, the final size of the Department of Defense's budget was $680 billion, $16 billion more than President Obama had requested. An additional $37 billion supplemental bill to support the wars in Iraq and Afghanistan was expected to pass in the spring of 2010, but has been delayed by the House of Representatives after passing the Senate.

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