[quote=@FalloutJack]
Will there not be tanks involved?  Or is that part of the 'classes to be available later' portion?
[/quote]

Tanks weren't really a thing until WW2. There [i]were[/i] tanks in WW1, but they were limited in number (unless you're France--looking at you, Renault FTs) and none really existed at this point of time (1914) outside of prototypes.