 Since KATUSA soldiers do not undergo special education for their MOS before their deployment and their mission trainings heavily rely on OJT from senior to junior KATUSAs, new KATUSAs usually take a few months of incubatory period before they can fully perform.One criticism of the KATUSA program arises from the difference in promotion systems; the ROK Army promotes its enlistees on a quota/time basis and not through the merit system.A KATUSA soldier may be senior in rank to an American counterpart with significantly more field experience.