U.S. Service members participate in a National Police Week opening ceremony at Langley Air Force Base, Va., May 16, 2016. The opening ceremony kicked off the official celebration of Police week across Joint Base Langley-Eustis. (U.S. Air Force photo by Staff Sgt. R. Alex Durbin)

U.S. Air Force Master Sgt. Nathan Shaw, Air Combat Command Headquarters Security Forces mission assurance training noncommissioned officer in charge, participates in a National Police Week opening ceremony at Langley Air Force Base, Va., May 16, 2016. The week memorializes law enforcement officers who laid down their lives in service to the nation. (U.S. Air Force photo by Staff Sgt. R. Alex Durbin)

A U.S. Airman and Soldier participate in a National Police Week opening ceremony at Langley Air Force Base, Va., May 16, 2016. Each year, May 15 marks Peace Officers' Memorial Day and the week in which the date falls as Police Week, which recognizes law enforcement officers who lost their lives in the line of duty. (U.S. Air Force photo by Staff Sgt. R. Alex Durbin)