They served because they both had political aspirations, and if you have any kind of military service, it looks great on your record. They grew up with Eisenhower and Kennedy as presidents, and both served, and they saw that effect they had on the voters.

If Kerry was just serving for the love of his country, and not trying to pad his resume, he would have stayed after his third purple heart. But he got his 3rd and got out of harm's way. Bush had plenty of money but his dad forced him in because he knew that having a military record is important to most voters.

If what someone did or did not do 30 years ago is more important to you then how they will vote on a certain subject, then by all means, vote however you wish.