I suspect they were FUI (Flying Under Influence).
It is not beneath a man to cry out mother's name even in moments before death.
It was common for japanese soldiers who were dying , the last thing they would be calling out for before death took them -- was for mother. This was case for all soldiers, who were dying. Even Americans, Chinese, Germans, Russians.
Have you seen movie "Saving Private Ryan" ? There was a scene there.... that captures this...