My single favorite Memorial Day movie...and, in general, my single favorite war / military movie:

Taking Chance

Just deeply, deeply moving.

Trailer:

The movie is based on the recollections of U.S. Marine Lt. Col Michael Strobl, a real person, who accompanied the remains of Lance Corporal Chance Phelps, a Marine fatally wounded by gunfire near Baghdad during the Iraq War, from Dover Air Force Base to Dubois, Wyoming in April 2004. He attended both Phelps's funeral and his memorial service, and wrote an essay about the entire experience, the emotions he felt and the people he met. It was published in the blog Blackfive on 23 April 2004 and was circulated widely on the Internet.