Home Base:Sasebo ND;
09/02/1924-01/04/1924=Sub.Div.26; Sasebo Defence Div.; Sasebo ND;
01/04/1924-01/12/1925=Sub.Div.26; Sub.Ron2; 2nd Fleet;
01/12/1925-15/12/1926=Sub.Div.26; Sub.Ron.1; 1stFleet; Combined Fleet;
15/12/1926-10/12/1928=Sub.Div.26; Sasebo Defence Div.; Sasebo ND;
10/12/1928-01/12/1930=Sub.Div.26; Sub.Ron.1; 1stFleet;
01/12/1930-15/11/1933=Sub.Div.26; Sasebo Defence Div.; Sasebo ND;
15/11/1933-15/11/1934=Sub.Div.26; Sasebo ND;
15/11/1934-15/11/1935=Sub.Div.26; Sasebo Guard Ron.; Sasebo ND;
15/11/1935-15/12/1938=Sub.Div.26; Sasebo ND;
15/12/1938-15/11/1939=Sub.Div.26; 3rd Reserve; Sasebo ND;
15/11/1939-15/11/1940=Sub.Div.26; 4rd Reserve; Sasebo ND;
15/11/1940-14/07/1942=Sub.Div.26; Sub.Ron.7; 4th Fleet; Combined Fleet;
14/07/1942-20/10/1942=Sub.Div.26; 5th Fleet; Combined Fleet;

01/11/1929-01/12/1930 ?=Reserve;
04/11/1931-16/07/1934 ?=Reserve;
15/12/1934-//193 ?=Reserve;
15/121938-15/11/1939=3th Reserve;
15/11/1939-15/11/1940=4th Reserve;

CEO:
CO:Lt.Cdr.Ishibashi Toshinari [36]=09/02/1924-01/12/1924;
CO:Lt.Cdr.Takatsuka Seigo [38]=01/12/1924-01/12/1926;
CO:Lt.Cdr.Oka Takazumi [39]=01/12/1926-20/05/1927;
CO:Lt.Cdr.Yatsushiro Sukeyoshi [40]=20/05/1927-16/05/1928;
CO:Lt.Cdr.Imaizumi Yoshijiro [44]= ?? -10/12/1928;
CO:Lt.Cdr.Nishina Kozo [44]=10/12/1928-01/11/1929;
CO:Lt.Cdr.Kamura Karoku [44]=01/11/1929- ?? ;
CO:Lt.Cdr.Kijima Moritsugu [44]= ?? -15/11/1930 ;
CO:Lt.Cdr.Takezaki Kaoru [45]=15/11/1930-01/12/1930;
CO:Lt.Cdr.Fukuda Isamu [44]=01/12/1930-04/11/1931;
CO:Lt.Shimai Takemi [47]= ?? -14/11/1931;
CO::Cdr..Hirano Rokuzu [41]= ?? -06/09/1933;
CO:Lt.Nishino Kozo [48]=06/09/1933- ?? ;
CO:Lt.Cdr.Nanri Katsuji [48]=16/07/1934-15/11/1934;
CO:Lt.Cdr.Shichiji Tsuneo [49]=15/11/1934-15/12/1934;
CO:Lt..Tonozuka Kinzo [50]=15/12/1934-15/11/1935;
CO:Lt.Cdr.Izu Hisaichi [51]=15/11/1935-15/02/1936;
CO:Lt.Togami Ichiro [51]=15/02/1936-01/12/1936;
CO:Lt.Matsumura Kanji [50]=01/12/1937-15/11/1938;
CO: ??
CO:Lt.Cdr.Kohiga Masaru [53]=05/10/1939-20/10/1939;
CO: ??
CO:Lt.Cdr.Ueno Toshitake [56]=15/11/1939- ?? ; ###;
CO:Lt.Cdr.Nakamura Shozo [54]=15/04/1940- ?? ;
CO:Lt. Cdr.Ohashi Katsuo [53]=15/10/1940-31/07/1941;
CO:Lt.Cdr.Yamamoto Hideo [56]=31/07/1941-23/05/1942;
CO:Lt.Tokutomi Toshisada [59]=23/05/1942-31/08/1942+KIA;

01/11/1924 Renumbered RO-61;
31/08/1942 Sunk=off Atka Is;52*36'N;173*57'W;
Depth Charges,Gunfire; US.DD.Reid; US.A/C;
5 Survivors; 60 KIA;
20/10/1942 Removed from Navy List;

[Lt.Cdr.Takatsuka Seigo] [38]
l/03/1926 Sasebo-l/03/1926 Okinawa=Transit;
30/03/1926 Okinawa-05/04/1926 Mako,Taiwan=Shanghai-Amoi=Training;
20/04/1926 Mako-26/04/1926 Sasebo=Chushan Is.=Training;
[Lt.Cdr.Oka Takazumi] [39]
27/03/1927 Saeki Bay-16/05/1927 Sasebo=Tsingtao=Training;
[Lt.Cdr.Yamamoto Hideo] [56]
12/12/1941 Kwajalein-27/12/1941 Kwajalein=Wake Is;
01/02/1942 Kwajalein-09/03/1942 Truk=e.Marshalls-Wake Is;(Repairs)
19/03/1942 Truk-22/03/1942 Saipan=Transit;
22/03/1942 Saipan-30/03/1942 Sasebo=Transit;
[Lt.Tokutomi Toshisada] [59]
31/05/1942 Sasebo-06/06/1942 Saipan=Transit;
07/06/1942 Saipan-10/06/1942 Truk=Transit;
27/06/1942 Truk-05/07/1942 Yokosuka=Transit;
24/07/1942 Yokosuka-30/07/1942 Paramushiro=Transit;
01/08/1942 Paramushiro-05/08/1942 Kiska=Transit;
08/08/1942 Kiska-10/08/1942 Kiska=e.Kiska;
11/08/1942 Kiska-13/08/1942 Kiska=e.Kiska;
15/08/1942 Kiska-17/08/1942 Kiska=e.Kiska;
28/08/1942 Kiska-31/08/1942 Sunk=Atka+

Sorties=6