Rank Insignia Comparison Table IJN Rank Insignia Officers (1931-45) Enlisted (1931-42) Enlisted (1942-45) Training Insignia USN Rank Insignia Officers (1941-43) Enlisted (1941-44)
IJN Petty Officers and Seamen Rank Insignia 1931-1942
一等兵曹 - Petty Officer 1st Class, 二等兵曹 - Petty Officer 2nd Class, 三等兵曹 - Petty Officer 3rd Class, 一等水兵 - Seaman 1st Class, 二等水兵 - Seaman 2nd Class, 三等水兵 - Seaman 3rd Class
Petty Officers
1st Class
Petty Officers
2nd Class
Petty Officers
3rd Class
Seamen
1st Class
Seamen
2nd Class
Seamen
3rd Class
兵科 [hei ka] Seaman Branch
一等兵曹 - Petty Officer 1st Class 二等兵曹 - Petty Officer 2nd Class 三等兵曹 - Petty Officer 3rd Class 一等水兵 - Seaman 1st Class 二等水兵 - Seaman 2nd Class 三等水兵 - Seaman 3rd Class
一等兵曹
[ittō heisō]
二等兵曹
[nitō heisō]
三等兵曹
[santō heisō]
一等水兵
[ittō suihei]
二等水兵
[nitō suihei]
三等水兵
[santō suihei]
航空科 [kōkū ka] Aviation Branch
一等空兵曹 - Aviation Petty Officer 1st Class 二等空兵曹 - Aviation Petty Officer 2nd Class 三等空兵曹 - Aviation Petty Officer 3rd Class 一等空兵 - Aviation Seaman 1st Class 二等空兵 - Aviation Seaman 2nd Class 三等空兵 - Aviation Seaman 3rd Class
一等航空兵曹
[ittō kōkū heisō]
二等航空兵曹
[nitō kōkū heisō]
三等航空兵曹
[santō kōkū heisō]
一等航空兵
[ittō kōkū hei]
二等航空兵
[nitō kōkū hei]
三等航空兵
[santō kōkū hei]
整備科 [seibi ka] Aviation Maintenance Branch
一等整備兵曹 - Aviation Maintenance Petty Officer 1st Class 二等整備兵曹 - Aviation Maintenance Petty Officer 2nd Class 三等整備兵曹 - Aviation Maintenance Petty Officer 3rd Class 一等整備兵 - Aviation Maintenance Seaman 1st Class 二等整備兵 - Aviation Maintenance Seaman 2nd Class 三等整備兵 - Aviation Maintenance Seaman 3rd Class
一等整備兵曹
[ittō seibi heisō]
二等整備兵曹
[nitō seibi heisō]
三等整備兵曹
[santō seibi heisō]
一等整備兵
[ittō seibi hei]
二等整備兵
[nitō seibi hei]
三等整備兵
[santō seibi hei]
機関科 [kikan ka] Engineering Branch
一等機関兵曹 - Engineering Petty Officer 1st Class 二等機関兵曹 - Engineering Petty Officer 2nd Class 三等機関兵曹 - Engineering Petty Officer 3rd Class 一等機関兵 - Engineering Seaman 1st Class 二等機関兵 - Engineering Seaman 2nd Class 三等機関兵 - Engineering Seaman 3rd Class
一等機関兵曹
[ittō kikan heisō]
二等機関兵曹
[nitō kikan heisō]
三等機関兵曹
[santō kikan heisō]
一等機関兵
[ittō kikan hei]
二等機関兵
[nitō kikan hei]
三等機関兵
[santō kikan hei]
工作科 [kōsaku ka] Construction and Repair Branch
一等工作兵曹 - Construction & Repair Petty Officer 1st Class 二等工作兵曹 - Construction & Repair Petty Officer 2nd Class 三等工作兵曹 - Construction & Repair Petty Officer 3rd Class 一等工作兵 - Construction & Repair Seaman 1st Class 二等工作兵 - Construction & Repair Seaman 2nd Class 三等工作兵 - Construction & Repair Seaman 3rd Class
一等工作兵曹
[ittō kōsaku heisō]
二等工作兵曹
[nitō kōsaku heisō]
三等工作兵曹
[santō kōsaku heisō]
一等工作兵
[ittō kōsaku hei]
二等工作兵
[nitō kōsaku hei]
三等工作兵
[santō kōsaku hei]
衛生科 [eisei ka] Medical/Nursing Branch
一等衛生兵曹 - Nursing Petty Officer 1st Class 二等衛生兵曹 - Nursing Petty Officer 2nd Class 三等衛生兵曹 - Nursing Petty Officer 3rd Class 一等衛生兵 - Nursing Seaman 1st Class 二等衛生兵 - Nursing Seaman 2nd Class 三等衛生兵 - Nursing Seaman 3rd Class
一等衛生兵曹
[ittō eisei heisō]
二等衛生兵曹
[nitō eisei heisō]
三等衛生兵曹
[santō eisei heisō]
一等衛生兵
[ittō eisei hei]
二等衛生兵
[nitō eisei hei]
三等衛生兵
[santō eisei hei]
主計科 [shukei ka] Paymaster Branch
一等主計兵曹 - Paymaster Petty Officer 1st Class 二等主計兵曹 - Paymaster Petty Officer 2nd Class 三等主計兵曹 - Paymaster Petty Officer 3rd Class 一等主計兵 - Paymaster Seaman 1st Class 二等主計兵 - Paymaster Seaman 2nd Class 三等主計兵 - Paymaster Seaman 3rd Class
一等主計兵曹
[ittō shukei heisō]
二等主計兵曹
[nitō shukei heisō]
三等主計兵曹
[santō shukei heisō]
一等主計兵
[ittō shukei hei]
二等主計兵
[nitō shukei hei]
三等主計兵
[santō shukei hei]
軍楽科 [gungaku ka] Musical Branch
一等軍楽兵曹 - Bandsman Petty Officer 1st Class 二等軍楽兵曹 - Bandsman Petty Officer 2nd Class 三等軍楽兵曹 - Bandsman Petty Officer 3rd Class 一等軍楽兵 - Bandsman Seaman 1st Class 二等軍楽兵 - Bandsman Seaman 2nd Class 三等軍楽兵 - Bandsman Seaman 3rd Class
一等軍楽兵曹
[ittō gungaku heisō]
二等軍楽兵曹
[nitō gungaku heisō]
三等軍楽兵曹
[santō gungaku heisō]
一等軍楽兵
[ittō gungaku hei]
二等軍楽兵
[nitō gungaku hei]
三等軍楽兵
[santō gungaku hei]
善行章 [zenkō shō] Good Conduct Chevrons
善行章 - Good Conduct Chevron 特別善行章 - Excellent Conduct Chevron 善行章二線 - Good Conduct Double Chevron 善行章三線 - Good Conduct Triple Chevron 善行章四線 - Good Conduct Quadruple Chevron 善行章五線 - Good Conduct Quintuple Chevron
善行章
[zenkō shō]
Good Conduct
特別善行章
[tokubetsu zenkō shō]
Excellent Conduct
善行章二線
[zenkō shō nisen]
Double Chevron
善行章三線
[zenkō shō sansen]
Triple Chevron
善行章四線
[zenkō shō yonsen]
Quadruple Chevron
善行章五線
[zenkō shō gosen]
Quintuple Chevron
Versions for Different Types of Uniform
For summer white For winter blue For field khaki

Sources:
1. Gary Nila, “Japanese Naval Aviation: Uniforms & Equipment 1937-1945”, 2002
2. 日本海軍軍装図鑑: 幕末・明治, Etsuka Yagyu “Uniforms of Japanese Navy 1867-1945”, 2003
3. Gary Nila, Robert A. Rolfe “Japanese Special Naval Landing Forces: Uniforms & Equipment 1932-1945”, 2006
4. 大日本帝国陸海軍―軍装と装備 明治・大正・昭和, Tadao Nakata “Imperial Japanese Army and Navy Uniforms & Equipment”,2009