800 More Troops Are Being Ordered to the US/Mexico Border Defense Secretary James Mattis could sign deployment orders for the troops as soon as Thursday. Their purpose will be assisting authorities to stop a caravan of migrants from Central America. The caravan of roughly 1,000 migrants are currently moving through Mexico. Many will seek asylum in the U.S. once they reach the border. The troops will provide technical support by providing fencing and wall materials. Sources say they will not engage in lethal action as a means of stopping the migrants. The troops are expected to be in position as early as next week.