Sentry is a professional military magazine published by the commander of U.S. Strategic Command to provide a forum for national security personnel. The opinions expressed in this magazine do not necessarily represent the policies or points of view of this command or any other agency of the U.S. government. All articles are written by Sentry staff unless otherwise noted. The secretary of defense has determined that the publication of this magazine is necessary for conducting public business as required by the Department of Defense by law.