Staff Sgt. Jonathan Bourgeois, 633d Security Forces squadron military working dog trainer, guides Drak, military working dog, through an obstacle course during validation training at Langley Air Force Base, Va., April 6, 2011. This training is designed to ensure each dog is adequately trained to protect service members from hazards in the field. (U.S. Air Force photo by Airman 1st Kayla Newman/Released)