TUCSON, Ariz.—Shortly after starting their midafternoon shift, Border Patrol agents Timothy McNeil and Jason Pope got their first 911 call: a 27-year-old Mexican man had been walking in the desert for 10 days and needed help.
The agents, both part of the elite Border Patrol Search, Trauma and Rescue unit, found Manuel Gutierrez Lopez in a tangle of mesquite trees about 30 miles west of Tucson and some 70 miles north of the border. Mr. Gutierrez, who had called 911 on his cellphone, told them he got separated from a group of eight or nine others a few days before and had been without water for at least two days. The temperature showed 104 degrees in Mr. McNeil’s truck when the call came in last week just after 3:30 p.m. ...