I think most people would agree. I certainly do.
But, in order to further discussion, I'll play devil's advocate here.
1. There's a reason it's called the Department of Defence, rather than the Department of Offence. If we layed down our guns, other countries might view this as a weakness and attempt to take over the US.
2. Wars can help fuel an economy. It keeps lots of people employed.
3. Terrorism dictates that we must actively combat those that wish harm to other people, regardless of nationality.