Well $10 Billion a month to a war we shouldn't have started didn't really help our debt out either.
I don't know if that number is accurate for the costs of fighting the war, but if we assume it is, then you are looking at $120B for a year. $120B would represent 0.92% percent of a $13T federal debt. For someone who doesn't support the war it is quite easy to look at that cost and say why not just stop it and bring everyone home, but when you compare it to the numbers for the federal debt of even the annual budget, it is sadly just a tiny little drop in the bucket.
The cuts that are going to need to be made to get this under control will be deep and painful. You can campaign to bring the troops home or cut back NASA or whatever else doesn't impact your day to day life, but at then end of the day the cuts that will have to be made are cuts that each and every one of us will feel, and that is why nobody in Washington has the stones to stand up and do it.