America has long been a military behemoth, but some of the other big spenders in the report, which was released Wednesday, might be more surprising. China, a clear geopolitical rival to the United States, is second on the list, its military spending far higher than any potential rivals in East Asia. Saudi Arabia, an important U.S. ally, is next on the list, it's defense budget bolstered by ongoing fears about the Islamic State and the need for regional stability.