Sam Mendes' epic war film, 1917, has a major reveal in the film's closing seconds. Here's what the 1917 really means for the characters and story.

Sam Mendes' upcoming World War I film 1917 features a strong cast with stars like Dean-Charles Chapman — even the cameos are recognizable faces.

Raising the stakes on the war movie genre, Mendes, along with co-writer Krysty Wilson-Cairns, cinematography master Roger Deakins, and their incredible film crew, creates a hyper realistic point of view on the carnage of the First World War.