“1917” (2019). Cast: George MacKay, Dean-Charles Chapman, Colin Firth, Benedict Cumberbatch, Mark Strong, Andrew Scott, Richard Madden, Daniel Mays, Claire Duburcq, Roland Maaser. Director: Sam Mendes. Screenplay: Sam Mendes and Krysty Wilson-Cairns. Web site. Trailer. How aware are we of our existence? We may think we have a good handle on it, but do we really? Sometimes we need a “reality check,” where we’re thrown into a scenario that gives us a greater and more mindful appreciation of the realm in which we find ourselves. That can be a rude awakening, for sure, as a pair of young soldiers discover for themselves in the new wartime drama, “1917.” With the brutal combat of World War I stuck in a virtual stalemate [...]