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The Rapid Naval Armaments Supplement Programme (マル急計画, 出師準備第一着作業建艦計画, Maru Kyū Keikaku, Suishi-Junbi Dai-Ichi Chakusagyō Kenkan Keikaku) was one of the armaments expansion plan of the Imperial Japanese Navy (IJN).

Background

In August 1941, the IJN started building warships for war. It extended to 293 vessels, 300,000 tons.

Table of vessels

Category	Class	Vessel number(s)	Completed	Converted	Cancelled
Heavy cruiser	Ibuki	#300 - 301		#300 was converted to aircraft carrier	#301
Aircraft carrier	Unryū	#302	Unryū (#302)
Seaplane tender	Akitsushima	#303			#303
Fleet oiler	Kazahaya	#304 - 307	Kazahaya (#304)	#306 was converted to the Hayasui class	#305, 307
Fleet oiler	Hayasui		Hayasui (#306)
Escort ship Type-A	Etorofu	#310 - 339	Etorofu (#310), Matsuwa (#311), Sado (#312), Oki (#313), Mutsure (#314), Iki (#315), Tsushima (#316), Wakamiya (#317), Hirado (#318), Fukae (#319), Amakusa (#321), Manju (#323), Kanju (#325), Kasado (#330)	#320, #322, #324, #326 - 329 and #331 - 339 were converted to the Mikura class
Escort ship Type-B	Mikura		Mikura (#320), Miyake (#322), Awaji (#324), Nōmi (#326), Kurahashi (#327), Chiburi (#329), Yashiro (#331), Kusagaki (#334)	#328, #333 and #339 were converted to the Hiburi class #332 and #335 - 338 were converted to the Ukuru class
	Hiburi		Hiburi (#328), Daitō (#333), Shōnan (#339)
	Ukuru		Ukuru (#332), Okinawa (#335), Amami (#336), Aguni (#337), Shinnan (#338)
Destroyer Type-A	Yūgumo	#340 - 355	Hayanami (#340), Hamanami (#341), Okinami (#342), Kishinami (#343), Asashimo (#344), Hayashimo (#345), Akishimo (#346), Kiyoshimo (#347)		#348 - 355
Destroyer Type-B	Akizuki	#360 - 369	Shimotsuki (#360), Fuyutsuki (#361), Harutsuki (#362), Yoizuki (#363), Natsuzuki (#364), Hanazuki (#366)		#367 - 369
Cruiser submarine Type-B	I-40	#370 - 375	I-40 (#370) to I-45 (#375)
Cruiser submarine Type-C	I-16	#376 - 378	I-46 (#376) to I-48 (#378)
Cruiser submarine Type-C	S49B	#379 - 381			#379 - 381
Medium-sized submarine	Ro-35	#385 - 396	Ro-44 (#385) to Ro-50 (#391), Ro-55 (#396)		#392 - 395
Medium-sized submarine	Ro-100	#400 - 408	Ro-109 (#400) to Ro-117 (#408),
Minesweeper	No.19	#410 - 437	No.25 (#410) to No.30 (#415), No.33 (#418), No.34 (#419), No.38 (#423), No.39 (#424), No.41 (#426)		#416 - 417, #420 - 422, #425, #427 - 437
Subchaser	No.13	#440 - 459	No.40 (#440) to No.58 (#458)		#459
Minelayer	Ajiro	#460 - 473	Ajiro (#460)		#461 - 473
Auxiliary minesweeper	Aux. No.1	#480 - 495	Aux. No.7 (#480) to Aux. No.22 (#495)
Auxiliary subchaser	Aux. No.1	#500 - 599	Aux. No.1 (#500) to Aux. No.100 (#599)
Patrol torpedo boat	No.10	#600	No.10 (#600)
Patrol torpedo boat	No.11	#601 - 617	No.11 (#601) to No.16 (#606)		#607 - 617

References

Rekishi Gunzō series, Gakken (Japan)
The Maru Special series, Ushio Shobō
Daiji Katagiri, Ship Name Chronicles of the Imperial Japanese Navy Combined Fleet, Kōjinsha (Japan), June 1988, ISBN 4-7698-0386-9
大日本帝国海軍艦艇一覧 (ja)