U.S. Air Force Senior Airman Cristopher Lopez Morales takes cover during a simulated missile attack during exercise Beverly Herd 17-3 at Osan Air Base, Republic of Korea, September 20, 2017. Beverly Herd 17-3 gives Team Osan the ability to assess their readiness level and to address any short comings. (U.S. Air Force photo by Staff Sgt. Tinese Jackson)