721st Naval Air Group
Mitsubishi G4M2E 721-328 of the 711th Attack Squadron (Kōnoike Air Base, Japan, February 1945)
Active	October 1, 1944–August 21, 1945
Country	Empire of Japan
Allegiance	Empire of Japan
Branch	Imperial Japanese Navy
Type	Naval aviation unit
Role	Bomber, manned bomb, fighter
Size	72 (1 October 1944)
Part of	Yokosuka Naval District Combined Fleet 11th Air Flotilla 5th Air Fleet
Garrison/HQ	Hyakurigahara, Japan Komatsu, Japan Kōnoike, Japan Kanoya, Japan Tomitaka, Japan Matsuyama, Japan Kan'onji, Japan Misawa, Japan Chitose, Japan
Nickname(s)	神雷部隊 Jinrai Butai (God thunder Corps)
Aircraft flown	G4M Type 1 "Betty" MXY7 Ohka "Baka" A6M Type 0 "Zeke" D4Y Suisei "Judy"
Engagements	World War II Battle of Okinawa
Insignia
Identification symbol	ヨF (YoF, October 1944) 721 (November 1944) 721 K (708th AS, 1945) 神 (Jin, fighter squadron, 1945)

The 721st Naval Air Group (第七二一海軍航空隊, Dai Nana-Futa-Hito Kaigun Kōkūtai) was an aircraft and airbase garrison unit of the Imperial Japanese Navy (IJN) during the Pacific campaign of World War II. This air group was organised for use in suicide attacks. It was otherwise known as the God Thunder Corps (神雷部隊, Jinrai Butai).

Structure

• Higher unit
  • Yokosuka Naval District (1 October 1944–14 November 1944)
  • Combined Fleet (15 November 1944–19 December 1944)
  • 11th Air Flotilla (20 December 1944–9 February 1945)
  • 5th Air Fleet (10 February 1945–21 August 1945, dissolved.)
• Lower unit
  • Attack bomber Squadron (1 October 1944–14 November 1944)
    • Renamed 711th Attack Squadron on 15 November 1944.
  • Ohka Squadron (1 October 1944–21 August 1945)
  • Suisei Squadron (15 November 1944–14 February 1945)
    • Aircraft and airmen were moved to 722nd Naval Air Group on 15 February 1945.
  • 305th Fighter Squadron (1 February 1945–19 August 1945)
  • 306th Fighter Squadron (15 November 1944–19 August 1945)
  • 307th Fighter Squadron (1 February 1945–19 August 1945)
  • 708th Attack Squadron (20 December 1944–21 August 1945)
  • 711th Attack Squadron (15 November 1944–5 May 1945, dissolved.)
    • Aircraft and airmen were moved to the 708th Attack Squadron on 5 May 1945.
  • Kamikaze
    • Shinken Unit
    • Shichisei Unit
    • Tsukuba Unit
    • Shōwa Unit
• Commanding officer
  • Capt. Motoharu Okamura (50) - 1 October 1944 - 30 September 1945