The United States spends more raw cash on its military forces than the next ten countries combined. There is really no equal to the USA's military expenditures.
In terms of dollars spent on military expenditure compared to GDP Qatar has the highest military expenditure at about 10% of GDP spent on the military, where the USA is only around 2-3%.
To answer your second question.. It is just an economic crisis not a depression, for most middle class people there is a small difference in the quality of life. Global security helps to ensure stable markets for American products world wide.