Planejammer Campaign Setting
The Computer restricts leaving Alpha Complex to Green clearance and above, and then only for good reasons. So, aside from Troubleshooters who may be sent into the great Outdoors, almost no one in Alpha Complex has seen so much as a blade of grass. This great mystique has led to the formation of the Sierra Club, devoted to sneaking out. Some want to escape forever, while others try to bring the wonders of nature to the less fortunate inside.