Staff Sgt. Daniel Hoover, 355th Operations Support Squadron aircrew flight equipment technician, El Salvadoran Air Force First Sgt. Raul Mauricio Molina Cedillos, aviation technician and U.S. Air Force Senior Master Sgt. Roberto Vasquez, 12th Air Force (Air Forces Southern) operations, plans and requirements superintendent, discus night vision goggles during a Subject Matter Expert Exchange at Davis-Monthan Air Force Base, Ariz., March 7, 2018. The exchange focused on the use and development of night vision goggles and the structure of the aircrew flight equipment shop. (U.S. Air Force photo by Staff Sgt. Angela Ruiz)