A proposed constitutional amendment to keep the United States government from dragging us into wars:
Sections 3 and 5 don't preclude a missile defense or any other kind of defense of this nation. It requires only that the President wait before attacking a foreign nation until a declaration of war has been issued. Even if some incapacity prevents Congress from making a declaration quickly, America could still defend itself. It just couldn't attack anyone else.
War is too dangerous an enterprise to leave in the hands of people who routinely lie in their own self-interest.
I welcome any suggestions for making this amendment more precise. (My thanks to Arthur Medina for some excellent suggestions, which have been incorporated.)