U.S. Marine Corps Sgt. Afaese Fiataugaluia, left, an

U.S. Marine Corps Sgt. Afaese Fiataugaluia, left, an imagery analyst and Pfc. Sarah Allen, right, an administrative specialist, both with Marine All-Weather Fighter Attack Squadron 242, participate in a Reconnaissance, Surveillance, and Decontamination (RSD) course at Marine Corps Air Station Iwakuni, Japan, May 16, 2019. Marine Aircraft Group 12 Chemical, Biological, Radiological, and Nuclear (CBRN) defense specialists taught the 3-day RSD course on how to mitigate the effects of a CBRN incident and identify, report and mark contaminated areas. (U.S. Marine Corps photo by Cpl. Richard Limone)