Alleged perpetrators of rape and sexual assault at the Australian Defence Force Academy over the past 20 years are still serving military officers or working for the department, an ABC Four Corners investigation has revealed.

The ABC program spoke to a former cadet they called "Jane", who said she was raped while at ADFA. She chose to stay with the army after the assault and has watched her attacker move up the ranks, even as she continues to confront her fears.

"To walk around the corner and literally bump into him again, was awful. I didn't know how to react. I felt frightened, I felt powerless. He was standing right behind me to collect his meal.

"And that was awful, to know what he had done and to still have him standing there, laughing and joking with his mates and knowing that he's still part of the organisation that I'm in," she told Four Corners.

Jane's assault was not an isolated incident, the program said. In many cases the department had promoted officers-in-training despite having serious accusations levelled against them.