WHY IS THE BORDER PATROL HERE?

Photo at left was taken in the Huachuca Mtns. at 8:40 am on August 14. It shows two persons in military dress, presumed to be National Guard, together with a Border patrol Agent. (Photo below shows agent's badge more clearly.) The guardsmen are at a well-known place for overlooking the valley to the southwest of the Coronado National Monument.

These National Guardsmen are armed according to a policy set forth in early June and they are at least two miles from the border.
(Note: The nongovernmental-issue camping chairs seem to defeat the camouflage clothing.)

Critics say that if the National Guard is under order not to apprehend or detain illegal aliens, why is the Border Patrol needed?