[They’ll be performing logistic and other support functions. They augment the 2,100 troops already deployed. The fresh troops are active-duty — regular military — however, as opposed to the 2,100 Guard troops. Note that there is time to prepare for an armed deployment before a wave of migrants can arrive, and we don’t know what is being discussed outside the public eye. But deploying troops in compliance with the Patriot Act and other existing law is not something there’s a script for. This situation may write a new one.]
A defense official confirmed to Military Times that Defense Secretary Jim Mattis will send 800 active-duty troops, not National Guard forces, to bolster the roughly 2,100 National Guardsmen who have already been positioned at the U.S.-Mexico border. These added forces will be providing administrative duties, not law enforcement, but the defense official did not know whether they would be armed or not.