Home 5K+ US Troops to Deploy in Response to Migrant Caravan (Multi-Video) Defense Secretary Jim Mattis has approved a request for assistance for additional military personnel to deploy to the U.S. Southwestern border to support DHS border control efforts there, DoD officials said. Like Operation Guardian Support, which is supported by 2,100 National Guardsmen, this additional assistance is in support of President Donald J. Trump’s April 4, 2018, memorandum, “Securing the Southern Border of the United States.” (Courtesy of the DoD)