Since it can be difficult to express true appreciation through words alone, I recently came across a touching song that might do a little better. It's called Note to the Unknown Soldier by Five For Fighting:
Along this theme, there is a great story told of Rabbi Aryeh Levine. A man named Elazar Cohen was the commander in charge of the Israeli army's helicopter squad. During wartime, his job was to fly directly into hostile enemy fire in order to rescue wounded soldiers. Cohen once came to the greatest sage of the time, Rabbi Levine, and asked for a blessing. To Cohen's shock, Rabbi Levine refused. He then asked, "But why?" Rabbi Levine responded, "Who am I to bless you? I truly believe that your merit in Heaven is greater than mine."
We should always keep in mind that the very term for Jew in Hebrew, Yehudi, is derived from the word meaning "one who thanks." So, as both a proud American and Jew, it's only fitting to be grateful for all our veterans and their families. Thank you for your service and sacrifice. You are truly the greatest among us.