If you haven't seen The Invisible War (Apple & Amazon), you need to. It's all well and good to know in the abstract about rape in the military, but hearing the stories from the victims' mouths, explaining how they've been victimized both by their attackers and the military, is wrenching.
Filmmakers Amy Ziering and Kirby Dick persuasively argue that military rape is an epidemic because commanding officers have the final say on whether there will be charges or trials. The CO is the the end all and be all, but the COs aren't trained legally or trained to deal with rape, specifically, as a crime. Perhaps an even bigger problem is that no CO wants to report a rape in the ranks because it reflects poorly on the CO's leadership. So there is a strong, systemic incentive to silence the victims.
The victims who took part in this film, both women and men, came across as dedicated soldiers, sailors and marines who wanted serve their country. They loved the military, but feel horribly betrayed by it. To a person, their lives have been shattered.
It doesn't appear that those at the top, the one's who are supposed to be dealing with the rape epidemic, truly appreciate the dynamics of the problem. Consequently, serial rapists run free in the military, mostly without fear of serious consequences.
Congress has been pushing the armed services to deal with rape and, at least according to this film, the effort has been bipartisan. Unfortunately, the military leadership has mostly paid lip service to the problem, instituting prevention programs that are largely useless because they don't address fundamental causes.
As data from a study I posted recently suggests, rape is less of a one-off crime than a way of life for rapists. Outside the military, there is a justice system that discourages serial rapists with prosecution, but the military makes an inviting home for rapists, much the way the Catholic Church long protected and enabled the child abusers in its midst.