Sorry Bill, but this time you seem to be off mark. As a percentage of the federal budget, "Defense" is some 17.7%, to which I would add the DHS and NSA, for a grand total of about 20%. That's not spare change.
When compared to the efficient way the other two agencies that command a large portion of the US budget (Health and SS) are run, it's hard to justify spending so much money on an endeavor so wasteful.
In the end, the US military adventures in the last few decades have put the country in a tough place. Some of the actions have been unjust and for that the US is loathed by quite a few, some other created the impression of the US being the World Cop, therefore many expect it to act at a finger snap (e.g. in Syria and I still remember the debacle over *not* intervening in Rwanda). In the long run, this is a losing situation, no matter how many resources are thrown at it.