Military working dog handlers from the 4th Security Forces Squadron, led by MWD Tessa, begin the first leg of a ruck march as part of Police Week, May 18, 2018, at Seymour Johnson Air Force Base, North Carolina. The ruck march was one of several events held by the 4th SFS throughout the week in observance of police officers who have died or been disabled in the line of duty. (U.S Air Force photo by Staff Sgt. Brittain Crolley)