Marine Lance Cpl. Aidan Miller and Cpl. Derek Shadrick

Marine Lance Cpl. Aidan Miller and Cpl. Derek Shadrick look for radioactive sources during a radiological training course at the Government Training Institute in Barnwell, South Carolina, Dec. 10, 2019. During the course, the Marines learn enhanced radiological and nuclear reconnaissance and surveillance while also testing new equipment to better handle future threats the Marine Corps may face. The Marines are chemical, biological, radiological and nuclear defense specialists with Marine Wing Headquarters Squadron 2. (U.S. Marine Corps photo by Cpl. Cody Rowe)