National Guard efforts leading to success on the U.S.-Mexico Border
Master Sgt. Darryl S. Ennels, of the 175th Civil Engineer Squadron, in the green battle dress uniform, directs concrete pouring into forms used to create bases for light poles which are positioned between the primary and secondary fences along the Arizona-Mexico border, June 6, 2007. (USAF photo/Senior Master Sgt. David H. Lipp)