Exercise hones war-time fighting techniques Published Aug. 29, 2011 By Tech. Sgt. Chad Thompson 51st Fighter Wing Public Affairs OSAN AIR BASE, Republic of Korea -- 51st Security Forces Squadron, together with base augmentees, setup concertina wire around the base Aug. 29, 2011 as the threat heightens during exercise Beverley-Midnight 11-04. Exercises such as this test Osan's ability to survive and operate during a war-time constraint. (U.S. Air Force photos/Tech. Sgt. Chad Thompson)