2nd Lt. Owen Bagget. Sources:
Regards, Janey. ATP-MEL-I/I-Turbine/Jet
And I mean no disrespect to Lt Bagget. Its just the evidence for his claim is indirect & circumstantial.
This probably explains why respected biographers of the airwar in the Pacific, like Martin Caidin, have left it out of their writings, as interesting as it is.
By the way, if you think strafing enemy combatants in a vulnerable position was strictly a Japanese habit I'd urge YOU to do a little more research. You can start with the battle of Bismark Sea.