>>268
Robin L. Rielly, Kamikaze Attacks of World War II:
A Complete History of Japanese Suicide Strikes on American Ships,
by Aircraft and Other Means, p.63.
"The primary means that Americans had of determining if a plane was friendly
was by Identification Friend or Foe (IFF), but this was not always reliable.
According to the commanding officer of the light minelayer Shannon,
Lt.Cmdr. W.T. Ingraham:

On several occasions it has been proven conclusively that
the enemy has in their possesion our Mk.6 IFF system.
Several times have planes showed "lights"
and proved themselves to be bogies by suiciding into ships.
Up until this time {15 July 1945} we have been almost correct
in assuming that any plane showing lights was friendly.
Now our primary means of identification during darkened hours
is doughtful value..."

特攻機が識別信号を欺瞞してるとまで思ったわけだけど、たぶんそんな装置はなくて
当時のIFF自体の信頼性がそんなものだったって話だよね