My dad was 17 in 1945. He served in the army in occupied Japan. If it wasn’t for the atomic bombs, I would most likely not have been born.
Also, the Soviets would have entered the war, and most likely we would have seen a divided Japan, just like Germany and Korea. And a Civil War that would have made the Korean Conflict look like child’s play.
My dad served with Patton’s Third Army in Europe. Upon V-E day he was sent back to the USA to train for the invasion of Japan. When they heard the A-bombs had been dropped, all the trainees gave a sigh of relief as they knew it was almost over.