The military is preparing to send 800 more troops to the Mexican border to help the Border Patrol, as a caravan of thousands of Central American migrants continues to move north.

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.

CNN first reported on Mattis’ plans to sign deployment orders, and said they will likely help out with fencing and other technical issues at likely border crossing points, and provide tents and medical care for law enforcement there.