Soldiers are a different population from the CATMAT population, who are travellers who are in a position where they can make informed choices as to whether to take drug A, drug B or drug C. Soldiers are generally told, “You're going to this location. Take this drug and have these vaccinations.” They're not given informed choices in the matter. In a sense, they shouldn't be because that can lead to an undermining of discipline.
On the other side of the equation, the standard of safety and tolerability must be of the highest level for soldiers. Therefore, giving a drug that's inherently going to be dangerous strikes me as being an affront to the vulnerability of soldiers. It's something that should never have happened.
By the same token, now that it has happened, every effort should be made to contact them by whatever means to see what can be done to mitigate their damaged circumstances. I can't really speak to the Canadian government and tell it what to do, but it seems to me that it's a matter of basic ethics to try to retrieve the damage now that it's occurred.