The Shortest Day

If we reserve our war-making machinery for nations which threaten our vital national interests, I propose that we invade the Cayman Islands.  

This one is pretty easy.  We could surround them with our aircraft carrier strike groups, seize the banks, and then pay for our aircraft carrier strike groups.

Also, we can find how many trillions of dollars have been off-shored, er, empirically. 

Next, a naval blockade of Zurich!  Admittedly, getting from the Rhine to the Aar to the Limmat River to Lake Zurich is a shade tricky, if scenic.  Surely, we have a hover-carrier by now.