I am stumped: I can't figure out when you are allowed to pay to turn units into more advance types, and when you can't. For example, I had two Caravels. One of them it just wouldn't let me upgrade into anything. The other, I could pay to turn into a destroyer.
I was quite disappointed to find (apparently) that Marines don't upgrade to Mechanized Infantry, unfortunately. I assume infantry do, though?
I was quite disappointed to find (apparently) that Marines don't upgrade to Mechanized Infantry, unfortunately. I assume infantry do, though?
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