Jehovah's Witnesses would completely agree with posts 5 and 8, but for entirely different reasons. In their system of beliefs, actions such as saluting a flag, saying the pledge, or honoring one's country in a visible show of support is equivalent to idol worship.
The question is then begged, are you bowing down to the golden calf by demonstrating respect for the country that has provided you with the freedom not to? Some would say yes, and respectfully, I would disagree. Just as honoring one's country is not idol worship, however, it equally is not submission to brainwashing. At all times, you have the right NOT to salute the flag, say the pledge, sing the Star-Spangled Banner, or otherwise react to our country's symbols in a patriotic fashion. It's called freedom.
Having said that, it is equally our freedom to demonstrate our national pride and American heritage by reacting to patriotic moments or symbols with an appropriate demonstration, be that a song, a salute, or a saying. Just as flag-burners have the right to desecrate the emblem of our liberty, we also have the right to conversely show our country its due degree of honor. Such behavior is not a "Pavlov's dogs" reaction of the mind, but rather, a gesture of the heart.