Senior Airman Samuel Ziegler, 51st Civil Engineer Squadron pavement and equipment journeyman, left, and Tech. Sgt. Michael Shannon, 51st CES pavement and equipment craftsman, watch for opposing force members during a simulated ground attack for operational readiness exercise Beverly Midnight 14-4 Sept. 18, 2014, at Osan Air Base, Republic of Korea. BM 14-4 is designed to test the joint operability of Team Osan and its partners. (U.S. Air Force photo by Senior Airman David Owsianka/Released)