President Trump’s sudden move to send more than 5,000 US troops to the Mexican border begs the question: what were they otherwise engaged in? As Jacob Hornberger notes at the link, they were training to kill more people overseas. Or preparing an invasion of some other country in the world. Or figuring out how to best enforce the embargoes and sanctions against the people of Iran, Cuba, North Korea, and elsewhere. But do we really need this? Are we about to be invaded?