Japanese submarine Ro-61

History
Japan
Name	Submarine No. 72
Builder	Mitsubishi, Kobe, Japan
Laid down	5 June 1922
Launched	19 May 1923
Completed	9 February 1924
Commissioned	9 February 1924
Renamed	Ro-60 on 1 November 1924
Decommissioned	1 November 1929
Recommissioned	1 December 1930
Decommissioned	4 November 1931
Recommissioned	16 July 1934
Decommissioned	15 December 1934
Recommissioned	15 November 1940
Fate	Sunk 31 August 1942
Stricken	20 October 1942
General characteristics
Class and type	Type L4 (Ro-60-class) submarine
Displacement	988 long tons (1,004 t) (surfaced) 1,301 tons (1,322 t) (submerged)
Length	78.39 m (257 ft 2 in)
Beam	7.41 m (24 ft 4 in)
Draft	3.96 m (13 ft 0 in)
Propulsion	2 × Vickers diesels, 2 shafts 2,400 bhp (surfaced), 1,600 (submerged)
Speed	15.7 knots (29.1 km/h) (surfaced) 8.6 knots (15.9 km/h) (submerged)
Range	5,500 nautical miles (10,200 km) at 10 knots (19 km/h) (surfaced) 80 nautical miles (150 km) at 5.7 knots (10.6 km/h) (submerged)
Test depth	60 m (200 ft)
Complement	48
Armament	6 × 533 mm torpedo tubes (6 × bow) 12 × 6th Year Type torpedoes 1 × 76.2 mm (3.00 in) L/40 naval gun 1 × 6.5 mm machine gun

Ro-61, originally named Submarine No. 72, was an Imperial Japanese Navy Type L submarine of the L4 subclass. She was in commission at various times from 1923 to 1934, and was recommissioned in 1940. Before World War II, she served in the waters of Japan. During World War II, she took part in the Battle of Wake Island and the Aleutian Islands campaign, conducting the first attack on an enemy ship ever carried out by a Japanese Ro-type submarine. She was sunk in August 1942.