Regular Officers (将校 "Shōkō") were graduates of Imperial Japanese Naval Academy. Reserve Officers (予備将校 "Yobi-shōkō") were university or college graduates, as opposed to going through the naval academy. Special Duty Officers (特務士官 "Tokumu-shikan") were the officers with the rank of Lieutenant or below, who were promoted from the rank of Warrant Officer (starting from the enlisted ranks). Typically the ranks discriminated in a way that the priority of taking command for Special Duty Officers was lower than that of Regular Officers or Reserve Officers. The distinction between Reserve Officers and Regular Officers was also highlighted in the rank insignia (see the table for details). This difference in the rank insignia was abolished in 1942, but the system itself remained.