Staff Sgt. Evan Farmer, 28th Security Forces Squadron flight chief, demonstrates how to use night vision equipment to an area youth during the South Dakota School of Mines & Technology Cultural Expo in Rapid City, S.D., March 29, 2014. Ellsworth Airmen from several squadrons volunteered to represent their units and career fields during the two-day event focused on diversity and culture. (U.S. Air Force photo by 2nd Lt. Rachel Allison/Released)