Cpl. Michael Williams, with chemical, biological,

Cpl. Michael Williams, with chemical, biological, radiological, nuclear, (CBRN) G-3, training, Marine Wing Headquarters Support Squadron, 1st Marine Aircraft Wing, III Marine Expeditionary Force, assembles a Drager 7000 oxygen breathing system during a joint training exercise on Okinawa, Japan, March 21, 2017. The exercise provided Marines and airmen with the skills necessary to detect and identify CBRN threats in diverse environments. (U.S. Marine Corps photo by Cpl. Janessa K. Pon)