First of all, you would have to find out that the report has concluded, and you don't always get that unless you follow up with the police. Then you would have to go through the access to information system itself to make the request. I believe it took a significant amount of time, maybe up to six months or a year, for me to get that.
One thing that's very difficult about it is that to make a complaint with the Military Police Complaints Commission, you have one year from the conclusion of an investigation. If there is a delay in receiving a copy of a report and it pushes you outside the one-year time limit, you have to get discretionary approval in order for the Military Police Complaints Commission to investigate.