U.S. Returns 12 Military Sites to S. Korea, Including Some at Yongsan Garrison Posted on This photo, taken on Sept. 1, 2019, shows an aerial view of the Yongsan Garrison in Seoul. (Yonhap) SEOUL, Dec. 11 (Korea Bizwire) — The United States on Friday returned 12 American military sites to South Korea, including some in central Seoul, amid persistent concerns that an additional delay would further dampen regional development efforts. During a virtual joint committee session of the Status of Forces Agreement (SOFA), Seoul and Washington agreed on the return of the sites, though they failed to bridge differences on who and how to shoulder environmental cleanup costs, Seoul officials said.