Operation: ABLE SENTRY

Operation: ABLE SENTRY 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 deployment of a unit of UNSC Marines—including Edward Buck—to provide force reconnaissance for Operation: PHALANX, an operation carried out by Spartan-IIs to evacuate civilians and observe Covenant invasion patterns on the planet.

Trivia

 * While John-117 and Spartan-IIs helped surviving civilians evacuate, the Battle of Circinius IV resulted in the entire population, with the exception of Hestati squad, being annihilated. This creates a contradiction.

List of appearances

 * Halo 5: Guardians
 * Limited Edition