US debt - $18,085,826,074,242
The last thing we need is another war.
47% of that debt is owned by foreign investors.
As well, one of the highest issues with this debt is the government's support of social insurance. (which in 2013 cost the US $882 Billion.) So by your logic, to stop this debt, we must stop war, and also get rid of everyone over 65 because they are a liability.
Don't blindly bring up something to say "WAR IS BAD" when the national debt is hardly a reason for saying war is bad. You also forget that Congress knows the economy is a fictitious system. They will keep raising the debt ceiling because they can, and it won't effect them or the world as a whole.
The price the US pays for its military may be a bit over the top, but it is nowhere near the main cause of all the debt your nation holds. Nothing is. It's been amassed over years of being a country, and it's pretty normal for a country to be in debt at this point in time, because everyone owes everyone money.