- "Priority one
Maintain station quarantine.
All other considerations secondary."
- —APOLLO's order directives[src]
Special Order 939 was a classified order given by Weyland-Yutani to APOLLO aboard Sevastopol Station in 2137. The order tasked APOLLO with the protection of the Xenomorph XX121 specimens, maintaining the station's quarantine and disallowing communications and deemed all other considerations secondary. After the Sevastopol Alien was disposed of, APOLLO responded by ordering the Working Joes to hunt down and kill the station's remaining human inhabitants.