Why are there so many "chickenhawks" in office?

I don't get why majority of people in Congress who are pushing this war are the ones who didn't serve in the military when they were of age. However, the majority of those who oppose the war are veterans. Isn't America going to wake up and see that if their Congressperson had served, than they might be more recalcitrant about sending our kids off to be cannon fodder? While the Bush administration and the Republicans really got the gold for chickenhawk-ism, the other side of the aisle is sure doing its job. Few, if any members of Obama's cabinet and his advisers (aside from those within DOD itself) were never out on the front lines themselves. If the Obama administration had more civilian cabinet members who had served, they would realize that a country has to pick its battles. We simply cannot go waging wars unless it is absolutely vital to our self-defense. It is unfair to the soldiers who had the courage to sign up, to send them out to war without having ever put yourself in their shoes. There is even a repository of notable Democrats, Republicans, and Independents who served and didn't serve. You'll be astonished at how many "neo-conservatives" had their patriotism displayed through bumper stickers instead of enlistment contracts.