For a better understanding of why we celebrate Memorial Day, go and check this site out. It is a treasure trove of information on the WWII Pacific Theater. My uncle John was a fighter pilot there.
Here is his post about the Sullivan Brother who all died when the USS Juneau went down. Tragic. This family epitomize the sense of patriotism after the bombing of Pearl Harbor. How we were all in this together as Americans. Lets not forget what they sacrificed as we observe Memorial Day.