My father, a Marine Corps veteran of Okinawa, was scheduled to be in that first wave. He never had a bad word to say about Harry Truman.
As was two of my uncles. Both said there was a hell of a party after they dropped those bombs and the war ended. They had been issued envelopes to put their personal belongings in before the invasion. Iwo and Okinawa confirmed what it was going to be like going into the mainland Japanese Island.