The Republic of Korea Air Force (RKAF) is the primary customer for the type. During 2000, the first KT-1 Woongbi was handed over to the RKAF; deliveries had originally been scheduled to commence two years earlier. By the end of that year, eight aircraft had been delivered to the service; reportedly, a rate of production of two aircraft per month had been achieved by this point. By November 2003, the assembly line was reportedly about to be put on hold following the completion of the RKAF's order; however, KAI aimed to restart production within two-three years based upon follow-on orders. However, a follow-on RKAF order for 20 aircraft was received that same month. The majority of the RKAF's fleet can be armed with both gun pods and rockets, which are intended to be used for weapons training.