Four undocumented immigrants attempt to conceal themselves beneath a tree from U.S. Border Patrol agents and a Mississippi Army National Guard LUH-72 Lakota helicopter along the U.S.-Mexico border near Nogales, Ariz., April 23, 2015. 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)