Operation: PHALANX

Operation: PHALANX was an operation of the United Nations Space Command on Circinius IV during the Human-Covenant War between 2531 and 2552. The operation saw the evacuation of civilians and observation of Covenant invasion patterns on the planet, utilizing intelligence gained from Operation: ABLE SENTRY's UNSC Marine force reconnaissance units. At least one Spartan-II—John-117—participated in the operation.