President Bush gave a radio address on the 27th in which he honored the US servicemen and women (he also gave an address at the West Point graduation this weekend).
You can also read past remarks from other presidents.
And I will end with President Lincoln's remarks from Gettysburg (they were on the top of the page listing all the past speeches and seemed appropriate):
"...that from these honored dead we take increased devotion to that cause for which they gave the last full measure of devotion, that we here highly resolve that these dead shall not have died in vain, that this nation under God, ...and that government of the people by the people and for the people shall not perish from the earth." --Abraham Lincoln