(Yonhap Interview) US army secretary will focus on upgrading Patriot system in S. Korea

(ATTN: UPDATES with military officials' comments on SM-3 system in paras 9-11, 13-14, ADDS photo of PAC-3 system) By Choi Kyong-ae

PYEONGTAEK, South Korea, Aug. 2 (Yonhap) -- The United States will focus on upgrading the Patriot PAC-2 missile system