I think Bush, Jr missed one because he was in Normandy for the ceremony there in 2004 for the 60th Anniversary. Clinton never missed one. I can't remember if Bush, Sr missed one or two, but he was a decorated veteran from WWII and I think he was at another ceremony for the reason he missed it. Not like the current President, because he wants to take a family vacation. That is the ultimate DISGRACE and DISRESPECT from the supposedly Commander In Chief.