The 10th Mountain Division has received a warning order to deploy troops to the southern border and has sent planners to U.S. Northern Command for the mission, according to an Army official who was not authorized to speak publicly. The 10th Mountain Division is designed to send combat-ready forces on short notice to hotspots around the world.
It is not clear how many soldiers from the division, a light-infantry formation, will be sent to the border. But two of its brigades are unavailable due to overseas deployments: an infantry brigade is in Europe, and its aviation brigade is in the process of returning from the Middle East.