Osan Then and Now Published Sept. 17, 2007 By Airman First Class Jaime Ciciora American Forces Network Osan OSAN AIR BASE, Republic of Korea -- Change is a part of life, and after 56 years one should expect quite a bit of it. Through almost six decades, Osan has grown and morphed into the base it is today, with more changes to come. To view the American Forces Network video documenting the transformation of Osan, click here.