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I've played quite a few campaign missions but none of them allow me to build the buildings for upgraded troops, even after having built everything else possible in a city or town. For example, I can get sentinels and crossbowmen, but the option to build the building which would enable me to get praetorians or marksmen never shows up! It's happening for all races.

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Have you confirmed you have all the resources necessary for the building? A lot of the buildings have high crystal requirements and there often isn't much crystal available on the maps. –  Jason Berkan Jul 6 '12 at 17:35
    
@Jason There is a difference in display between a building you don't have enough resources for, and a building that you are unable to build because it is locked. The latter just doesn't appear at all. –  bwarner Jul 6 '12 at 19:03
    
@bwarner - Ah. It's been too long since I played, apparently. –  Jason Berkan Jul 6 '12 at 19:27
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during the campaign, some buildings and upgrades are locked. As you progress through the campaign, they'll open up, sometimes during a mission after completing specific quests, sometimes on the next map.

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