U.S. Border Patrol agents escort four undocumented immigrants captured near the U.S.-Mexico border on April 23, 2015. A Mississippi Army National Guard LUH-72 Lakota helicopter helped locate the men beneath a tree along a mountainside near Nogales, Ariz. Six MSARNG Soldiers with the 1st Battalion, 185th Aviation Regiment, of Tupelo, Miss., are assigned to Task Force Raven, which works with multiple federal agencies in securing the border. (Mississippi Army National Guard photo by Staff Sgt. Scott Tynes, JFH-MS Public Affairs Office/Released)