I can see that. The only missions that I have encountered so far are: - Kill all thieves in a haven. (save haven from thieves) - Kill all aliens in a haven. (save haven from aliens) - Kill all aliens in an abandoned site to get supplies. (collect supplies) These missions can be in either infected or not infected sites. If the site is infected, you will see the big "mushroom" that spews a dark cloud on the map. - Boss fight in alien "base".