The Pentagon is surging approximately 1,500 active-duty troops to the southern U.S. border under orders from President Donald Trump to assist in flying migrants out of the country as well as building barriers, as the commander in chief flexes his new authority and attempts to make good on a campaign promise to curb immigration into the country.

Those active-duty forces are made up of 1,000 Army soldiers and approximately 500 Marines. It also includes helicopters with associated crews and intelligence analysts “to support increased detection and monitoring efforts,” Acting Secretary of Defense Robert Salesses said in a statement.