So, a big issue in these events is that when a squad’s given out, one side gets their special squad far earlier than the other, which means it’s not only easier to get, but that plays of the latter campaign (or in the future the latter country) will have to deal with the sometimes Very Powerful squads for a while, and might be unable to get the squad for their preferred country if they miss enough days. This can be very upsetting and isn’t conductive to a good dynamic between countries, I feel.
So instead of these reinforcement events awarding the squad itself, these events should award special currency to purchase the event squads, so both allies and axis can get theirs at the same time. This will prevent the Imbalance in when the squads are acquired.