Folks should also remember that Orca is an outlier - both JFK and Joseph P Jr served with distinction in WW2, Joseph paying the ultimate price.
People who quibble with the official version of the PT-109 story (and the official version is crap) should keep in mind that JFK volunteered for just about the most dangerous duty in the Navy that would get him into the fight in any reasonable amount of time. He put his butt squarely on the line, and so did Joseph. Bobby also ent Navy, but he got out of college in '48 and they didn't really need him.