Add additional slot to academy and share both slots for both factions in campaing.
currently we can train 1 soldier for each faction in all campaing
i suggest to change it so we can train 2 soldiers in same campaing at same time but that will ‘lock’ academy for another faction in that campaing
example: we can but 3 axis assaulters and 3 axis troopers in berlin to academy but we cant train any soviet soldiers until another one is finished