Film and military buffs viewed dozens of movies about military life and culture at the sixth annual GI Film Festival in Washington, D.C., which wrapped up May 20. A rundown of the critics’ favorites, and their trailers: Best Narrative Feature: “Memorial Day,” directed by Sam Fischer [youtube]http://www.youtube.com/watch?v=2SWBqhWDYRQ&[/youtube] In this fictional narrative, Kyle is about to return to combat in Iraq, and he’s explaining to a doctor why he’s so compelled to collect souvenirs from the war. When he was a kid, Kyle explains, he approached his grandfather, Bud, with the contents of Bud’s footlocker, which was stuffed with mementos of…