No Armed Forces

At Wikipedia: List of countries without armed forces.

Here are those with absolutely no military:

Andorra, Costa Rica, Dominica, Grenada, Haiti, Kiribati, Liechtenstein, Marshall Islands, Mauritius, Micronesia, Nauru, Palau, Saint Lucia, Saint Vincent and the Grenadines, Samoa, Solomon Islands, Tuvalu, and Vatican City.

These have no standing army, but have limited military forces:

Iceland, Monaco, and Panama

One of these days, the U.S. will invade all of these countries and take them over. That'll teach 'em.