hi orda,
there's no doubt that the us is a military goliath. but bear in mind that chinese spending is catching up fast as its economy grows.
at present rates of growth, i would hazard a guess that china's military expenditure will equal us expenditure within 10 years or so.
also, us spending on its military has reduced from 4.7% to 3.8% of GDP since 2010.
so although these statements about us expenditure may once have held true, i am not sure they do currently.
http://data.worldbank.org/indicator/MS.MIL.XPND.GD.ZS