What happened to Jeloudov is a part of life in the armed forces that hardly anyone talks about: male-on-male sexual assault. In the staunchly traditional military culture, it’s an ugly secret, kept hidden by layers of personal shame and official denial. Last year nearly 50,000 male veterans screened positive for “military sexual trauma” at the Department of Veterans Affairs, up from just over 30,000 in 2003. For the victims, the experience is a special kind of hell—a soldier can’t just quit his job to get away from his abusers. But now, as the Pentagon has begun to acknowledge the rampant...