Special Agent Christopher Spangler, Office of Special Investigations special agent in charge of Detachment 422, uses the OSI evidence box for tools to search a simulated crime scene for clues, Oct. 4, 2017, Altus Air Force Base, Oklahoma. OSI’s duties include felony investigations, administering polygraphs, counter intelligence and other specific investigative purposes. (U.S. Air Force Photo by Airman 1st Class Jackson N. Haddon/Released).