Happy Pearl Harbor Day, the 76th anniversary. My mom and dad were there, got married in February 1942, the first time my dad could get a weekend off. He was a Lt. in the artillery and claimed his battery got off the first anti-aircraft shots that morning. Not entirely sure they were at Japanese planes. So I am a biological Pearl Harbor Survivor, although not born until 1944. My genes were there.
Oh, the do-over idea. Go back in time and somehow convince the military and naval forces that the Japanese were coming. Maybe they would call off the attack if they knew we were prepared. Change WW2. What happens if we stay out of it? Might be as simple as a letter to a newspaper, say the New York Times, setting forth the Japanese plans and how they succeeded the first time. Should mess with their plan if it were printed in a US newspaper.