So, it comes with a good mission editor but unfortunately due to knowledge and time restraints I can't give you more detailed information on it. (simhq.com)
It includes a base of single player and multiplayer missions that provide a decent start, and the well known Arma 2 style mission editor for quality third party mission options. (simhq.com)
Choose to play tactical missions only with 25 predefined missions and a custom mission editor to make your own missions. (aliensvshumansapp.com)