The first President Bush was a war hero. He was a navy pilot during World War Two. By 1944, he had flown 58 combat missions for which he received the Distinguished Flying Cross, three Air Medals, and the Presidential Unit Citation awarded aboard the San Jacinto.
He also almost died. Wikipedia notes, "After finishing flight training he was assigned to Torpedo squadron (VT-51) as photographic officer in September 1943. As part of Air Group 51, his squadron was based on U.S.S. San Jacinto in the spring of 1944. San Jacinto was part of Task Force 58 that participated in operations against Marcus and Wake Islands in May, and then in the Marianas during June. On June 19 the task force triumphed in one of the largest air battles of the war. On his return from the mission Bush's aircraft made a forced water landing. A submarine rescued the young pilot, although the plane was lost as well as the life of his navigator."
In all, the San Jacinto suffered a 50% casualty rate among pilots during the war. President Bush was very fortunate to have survived World War Two.
What if Bush had died like his navigator did in 1944? How different would history have been? How would this impact the current world? There would have been no George HW Bush vice-presidency or presidency. Further, George W. and Jeb would have never been born so they would not now be President of the USA and Governor of Florida. I have the feeling that alternate history writers are going to have a field day with this scenario someday.