Mark Luken, engraver at West River Monument Company, places a stencil on a memorial monument in Rapid City, S.D., Oct. 18, 2016. This monument memorializes Special Agent Peter Taub, an OSI agent who was killed in action near Bagram Airfield, Afghanistan Dec. 21, 2015. (U.S. Air Force photo by Senior Airman Rebecca Imwalle)