ROKS CheongjuROKS Cheongju is the ninth ship of the Ulsan-class frigate in the Republic of Korea Navy. She is named after the city, Cheongju.Development10 ships were launched and commissioned from 1980 to 1993. They have 3 different variants which consists of Flight I, Flight II and Flight III.Construction and careerROKS Cheongju was launched on 20 March 1992 by Daewoo Shipbuilding and commissioned on 1 June 1993.