Sure, if you were asking _me_ where I would save money, defense would be ahead of aid. My point that the US debt is staggering, and it might take more than just skipping an oil change, you might need to do something drastic like selling the car.
Cutting back on oil changes (USAID) or your gym membership (NIH) will do nothing if your "spending problem" is actually you not taking up enough shifts at work (taxes, cutting of).
The US debt is going up, and that's because there are sizeable annual deficits: perhaps there should be less cutting of taxes (for the rich, by the GOP)—and maybe even raise them—and see if that helps.