-how to do actually increase the population limit? my population limit just stays from 200 - 300 even i set the max to 2000.
-how do you build military tents? like in battle of normandy campaingn the americans have.
-how do you get medics?
-how do you get machine gun nests? i dont have them even im in epoch 9 - 10!

thanks if you can help!

You can increase the pop limit if you are 2 player it is can to 600 you get medic at university

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-how to do actually increase the population limit? my population limit just stays from 200 - 300 even i set the max to 2000.

If you are talking about online combat, that 2,000 is spread amongst ALL people fighting. So if 8 people are in the game, you will likely only get about 320 population or thereabouts. Defeating civs will remove them from the game and allow you to take more territories, build more houses, ect, ect, to get more population! There are also some technology upgrades which will allow you to increase the pop cap.

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-how do you build military tents? like in battle of normandy campaingn the americans have.

Uh... I think that that's a special unit, the same way you can't build certain types of houses and the like. I don't think it's possibly to construct those, but I can't be sure.

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-how do you get medics?

I always thought it was the hospital, but if you can't produce them there, have a once-over of the barracks. I'm pretty sure they are produced at the hospital though, but that might just be the original EE speaking through me.

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-how do you get machine gun nests? i dont have them even im in epoch 9 - 10!

Machine gun nests should be possible about there, maybe a little further.