From left to right, Army Staff Sgt. Raul Duenas, an Air Defense Battle Management System Operator with Headquarters and Headquarters Battery, 35th Air Defense Artillery Brigade, instructs Army Spc. Ryan Buchanan, an Air Defense Enhanced Early Warning Operator from HHB, 35th ADA Brigade, to check their computer systems at the Fire Direction Center at Osan Air Base, South Korea, Aug. 22, 2017. Army photo by Staff Sgt. Monik Phan