Authorities say a military service member assigned to help secure the U.S.-Mexico border has died in southern Arizona. The military service member with the Southwest Border Support Mission was found dead Sunday near Ajo, Arizona, according to officials at Peterson Air Force Base in Colorado Springs, Colorado. They say the incident is under investigation, but foul play isn’t suspected.

It’s the second such death this month. The base previously announced the June 1 death of another military service member near Nogales, Arizona, who also was assigned to the Southwest Border Support Mission.

The name of the military service member wasn’t released. Base officials said foul play wasn’t suspected in that death either.

Military service member found dead in southern Arizona