The Republic-Ford JB-2, also known as the Thunderbug, KGW and LTV-N-2 Loon, was a United States copy of the German V-1 flying bomb. Developed in 1944, and planned to be used in the United States invasion of Japan (Operation Downfall), the JB-2 was never used in combat. It was the most successful of the United States Army Air Forces Jet Bomb (JB) projects (JB-1 through JB-10) during World War II. Postwar, the JB-2 played a significant role in the development of more advanced surface-to-surface tactical missile systems such as the MGM-1 Matador and later MGM-13 Mace.
The example here is launched from Balao-class submarine USS Carbonero (AGSS-337) in the 1950s and is then followed by a chase plane. At 0:47 the wings are jettisoned to terminate the flight (unlike the original V-1 that set the controls to put it in a steep dive) and it crashes into the sea.
