That inspired me to google a few facts about the US military budget.
From Military budget of the United States - Wikipedia:
From List of countries by military expenditures - Wikipedia:The 2009 U.S. military budget accounts for approximately 40% of global arms spending and is over six times larger than the military budget of China (compared at the nominal US dollar/ Renminbi rate, not the PPP rate). The United States and its close allies are responsible for two-thirds to three-quarters of the world's military spending (of which, in turn, the U.S. is responsible for the majority).In 2005, the United States spent 4.06% of its GDP on its military (considering only basic Department of Defense budget spending), more than France's 2.6% and less than Saudi Arabia's 10%. This is historically low for the United States since it peaked in 1944 at 37.8% of GDP (it reached the lowest point of 3.0% in 1999–2001). Even during the peak of theVietnam War the percentage reached a high of 9.4% in 1968.
The world's top 5 largest military budgets in 2009. Figures sourced from SIPRI.
Also interesting: Center for Arms Control and Non-Proliferation: U.S. vs. Global Defense Spending