The command post becomes available to build once you have a level 3 HQ and a level 1 Medical bay. Once you build it your hero will become available.
The hero is a really useful unit which you gain experience for. As they level up you can spend skill points on some very useful abilities The hero is also great for sending on marches as they can hold a lot of resources, and are quite strong for combat too!
We'll take note of things people find confusing and see what we can do to make them clearer.