U.S. Air Force Maj. Claudio Santo, 12th Air Force (Air Forces Southern) El Salvador International Affairs specialist, describes the Subject Matter Expert Exchange between the 357th Fighter Squadron aircrew flight equipment shop and the El Salvadoran Air Force at Davis-Monthan Air Force Base, Ariz., March 8, 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)