ELLSWORTH AIR FORCE BASE, S.D. -- Bak, 28th Security Forces Squadron military working dog, bites down on Staff Sgt. Kevin Nelson, 28 SFS K-9 unit trainer, during a training session, June 24. Sergeant Nelson wears a Òbite suitÓ to protect his legs from serious injury during the training. (U.S. Air Force photo/Airman 1st Class Anthony Sanchelli)
