re: You have NO enemies
Cite me a country that wants to invade, occupy and overwhelm the US?
With the US DOD budget so much higher than any other one, it is out of the question.
Terrorists are more often home grown like 7/7 in London, Mc Veigh in Oklahoma, the IRA in Ireland, the ETA in Spain.
Terrorists do not represent a country.
You cannot fight terrorism with soldiers. The fact the US is now stuck in Iraq is a proof. You attracted terrorists in Iraq or made them become so when your contry invaded Iraq. You cannot stop them with tankers, storming in houses.
You need good relationships with police forces worldwide, to combat them. And that means trust between governments, not imply they help the terrorists when there's no evidence nor even need for them to get it.