...to play a closeted gay military man
I was reading the novel by John Boyne called THE ABSOLUTIST; the same author who wrote the novel to the 2008 film THE BOY IN THE STRIPED PAJAMAS. And Claflin would be perfect to play the role of Will Bancroft.
I highly recommend all of you to read the novel ("The Absolutist" by John Boyne). It's a beautiful story. Anyhow, here's my suggested casting for the movie adaptation: http://www.imdb.com/list/bb1tSvWUly0/