It would depend more on conditions. The militaries are not the same from one country to the other. For example, skin cancer is more common in Australia. There is research on that in Australia that is particular to military veterans and under what conditions you can presume. There is not much research on the potential for particular presumptive conditions in Canada.
There would have to be a bit more research—probably a lot more research—to do the literature review to be able to generalize that information to the veteran population in Canada.
It's not impossible, but it's difficult.