much happened that day. most notably thing that made me think of this was the paratroopers.
So in this event squads could be doubled or even tripled and player count could be increased. randomly in the match you could spawn as a paratrooper and dropping from a plane. this could possibly be done when the axis is leading by a lot.
Along with this, level unlocks should be universal for all the campaigns. and each campaign should have a unique shorter unlock tree with unique stuff. in the games current state its basically “choose a campaign and side, this choice is permanent” since the average player isnt going to finish any of the campaigns and if you have even just gotten to level 3 in a campaign you wouldnt want to switch since then you have to start over again, and unlock the same stuff you already unlocked. this could also make it so some campaigns have less players since switching campaign is in a way punished.