We know that armies consist of 4 or 5 units (depending on whether you have the Pentagon MW). We also know from Firaxis posts that units can be upgraded, but only in cities.
The question is then, does the whole army have to taken into a city to upgrade units? or are armies flexible structures that can be changed in structure in the field?
If you have 2 mech inf. and 2 tanks, can you swap in an extra tank for a mech inf while still in the field? Or does an army have to be disbanded and reformed? Can reforming/switching units only happen in cities?
The question is then, does the whole army have to taken into a city to upgrade units? or are armies flexible structures that can be changed in structure in the field?
If you have 2 mech inf. and 2 tanks, can you swap in an extra tank for a mech inf while still in the field? Or does an army have to be disbanded and reformed? Can reforming/switching units only happen in cities?
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