Sem, a South Dakota Highway Patrol police K-9, waits to compete in the 28th Security Forces Squadron military working dog competition held in honor of National Police Week at the K-9 obedience course on Ellsworth Air Force Base, S.D., May 16, 2019. National Police week is held in observance of law enforcement officers who have died in the line of duty while protecting communities nationwide. (U.S. Air Force photo by Airman 1st Class Christina Bennett)