Col. Larry Christensen, commander, 185 Air Refueling Wing (ARW), presents Master Sgt. David Brink, 185 ARW Crew Chief, with the Meritorious Service Medal, on the occasion of his retirement at the Air National Guard base in Sioux City, Iowa on 4 March, 2018. Brink, a long time unit member, retired from the 185th after more than 30 years of service with the Iowa Air National Guard. (U.S. Air National Guard photo by Master Sgt. Bill Wiseman/Released)