U.S. Air Force Lt. Col. Walter Sorensen, Joint Base Security, JB2 commander, pets military working dog Riki at the veterinary treatment facility on Joint Base Pearl Harbor-Hickam, Hawaii, March 2, 2017. After six-years of service, Riki was euthanized due to progressive incurable illness. (U.S. Air Force photo by Tech. Sgt. Heather Redman)