By Ward Clark In the previous two world wars, the United States had the luxury of two great oceans separating our homeland from the fighting. In the Great War, the American heartland was out of reach of our primary foe, Germany. In World War II, the Empire of Japan managed to seize islands in Alaska's Aleutian chain, but were driven off. In any future conflict, though, we won't have that luxury. In 1917 and 1941, our military bases in the United States were sheltered from attack, but in any possible major future conflict, they simply won't be. So now, to deal with this likelihood, the Department of War is instituting a plan to make our military bases self-sufficient for at least 90 days — capable of operating with no outside support. This is, candidly, something that should have been done years ago. The Pentagon is preparing U.S. military bases to keep operating for at least 90 days without outside support as it prepares for the possibility of a major war that could...