Nov. 1, 2018 Osan's A-10 greets visitors at Sacheon Air Show The 25th Fighter Squadron assigned to Osan Air Base, Republic of Korea, represented the U.S. Air Force with an A-10 Thunderbolt ll static display at the Gyeongnam Sacheon Aerospace Expo at Sacheon Air Base, ROK, Oct. 25-27, 2018.