Photos: BB 14-02 tests security measures

Airman 1st Class Tiffani Vincent and Senior Airman Pavel Aragon, 51st Security Forces Squadron entry controllers, man a defensive fighting position outside Bldg. 1097 during Operational Readiness Exercise Beverly Bulldog 14-02 at Osan Air Base, Republic of Korea, May 5, 2014. Defenders placed in DFPs must stay alert for any possible suspicious activity in the area. (U.S. Air Force photo/Airman 1st Class Ashley J. Thum)

Airman 1st Class Tiffani Vincent and Senior Airman Pavel Aragon, 51st Security Forces Squadron entry controllers, man a defensive fighting position outside Bldg. 1097 during Operational Readiness Exercise Beverly Bulldog 14-02 at Osan Air Base, Republic of Korea, May 5, 2014. Defenders placed in DFPs must stay alert for any possible suspicious activity in the area. (U.S. Air Force photo/Airman 1st Class Ashley J. Thum)

Concertina wire unfolds around Bldg. 1097 during Operational Readiness Exercise Beverly Bulldog 14-02 at Osan Air Base, Republic of Korea, May 5, 2014. The 51st Security Forces Squadron began implementing increased security measures around Bldg. 1097 to mitigate the chance of opposition forces infiltrating the area. (U.S. Air Force photo/Airman 1st Class Ashley J. Thum)

Concertina wire unfolds around Bldg. 1097 during Operational Readiness Exercise Beverly Bulldog 14-02 at Osan Air Base, Republic of Korea, May 5, 2014. The 51st Security Forces Squadron began implementing increased security measures around Bldg. 1097 to mitigate the chance of opposition forces infiltrating the area. (U.S. Air Force photo/Airman 1st Class Ashley J. Thum)

Airman 1st Class Cody Linday, left, 51st Security Forces Squadron entry controller, acts as a detained member of opposition forces while A1C David Diez, 51st SFS entry controller, guards him during Operational Readiness Exercise Beverly Bulldog 14-02 at Osan Air Base, Republic of Korea, May 5, 2014. Staff Sgt. Juan Valles, 51st SFS area supervisor, was also part of the training scenario that required himself and Diez to wait for Office of Special Investigations personnel to reach the scene and interrogate their detainee. (U.S. Air Force photo/Airman 1st Class Ashley J. Thum)

Airman 1st Class Cody Linday, left, 51st Security Forces Squadron entry controller, acts as a detained member of opposition forces while A1C David Diez, 51st SFS entry controller, guards him during Operational Readiness Exercise Beverly Bulldog 14-02 at Osan Air Base, Republic of Korea, May 5, 2014. Staff Sgt. Juan Valles, 51st SFS area supervisor, was also part of the training scenario that required himself and Diez to wait for Office of Special Investigations personnel to reach the scene and interrogate their detainee. (U.S. Air Force photo/Airman 1st Class Ashley J. Thum)