U.S. Air Force Senior Airman Elissa Humphery, 8th Civil Engineer Squadron emergency management journeyman, right, and Staff Sgt. Adam Ruiz, 8th Medical Operations Squadron industrial hygiene noncommissioned officer in charge, fill a vile with an unknown chemical during a joint hazardous material training scenario at Kunsan Air Base, Republic of Korea, July 21, 2017. The 8th CES hosted the training to enhance their ability to operate with their ROKAF counterparts. (U.S. Air Force photo by Senior Airman Michael Hunsaker/ Released)