I think those percentages are low, in actual fact. However, I do not have any research data on the armed forces. Dr. Guay, however, may be able to provide you with more information.
I should also say that there is a great deal of shame and stigmatization in the Canadian armed forces. Research can only be done if people answer. Some female soldiers told me that they had experienced horrors, and had been raped. They told me, however, that they had no intention of talking about it, since they already had to work twice as hard to remain in the army and not be considered as second-class soldiers.
We need to understand that it is difficult for researchers to get an exact percentage because of the shame that soldiers feel, because it is not easy to assess them and because it is not necessarily a desirable percentage, politically speaking.