An amateur radio friend of mine was a WW2 radio intercept operator in San Francisco. He was fluent in the “Kata” Morse code*. He is the chief American consultant for a Japanese radio company and, in trips to Japan over the years, has heard many “hams” in Japan using this code. Despite repeated efforts over the years to meet the guys he listened to in the war, they have - to the man - refused.
On an internet website I frequent, I was told of a member's father ... was attacked by an old Japanese man when he saw his father’s Marine Corps ring. So many of them have gone to their graves with their anger intact. Sad.
*In the International (Morse) code, we would send the word “Toyota” in 6 letters. In the Japanese phonetic Kata code, it is sent in three:“To - Yo - Ta”.