/u/Lubyak has recently answered How bad was the interservice rivalry in the Japanese military during World War II? Did it affect their performance in the war? and can still be upvoted there.

EDIT: Lubyak also contributed to the thread Why exactly did Nazi Germany and Japan ally amongst one another? Nazi ideology considered the Japanese inferior and Japanese ideology considered the Japanese to be superior to Europeans so what was the potential endgame between the two? Also, why didn't Japan open a 2nd front against the Soviets? but the link goes to an answer by /u/Starwarsnerd222 about the conflicting goals of the Imperial Japanese Army and Imperial Japanese Navy. These answers are also less than six months old.