An operation is a planned military offensive conducted by a military force, generally against a specific enemy objective or group of objectives. Operations can be large scale military campaigns, battles or small, covert insertions. Operations receive unique code words to distinguish themselves from other actions without giving away sensitive information that could be intercepted by enemy forces.
Known UNSC Operations
- Operation: ABLE SENTRY - A force reconnaissance operation Edward Buck participated in to prepare for Operation: PHALANX on Circinius IV.
- Operation: ASTUTE TIGER - An operation Edward Buck participated in on Harvest which consisted of deploying ADM's to predicted Covenant landing zones prior to UNSC evacuation.
- Operation: BLIND FAITH (2552) - A combined UNSC and Sangheili battlegroup follow the Prophet of Truth to Installation 00, locating and assassinating the leader of the Covenant.
- Operation: BLOWBACK (2552) - The UNSC covert operation to gather intelligence and destroy Covenant ships in Sub-sector 35.
- Operation: CHARLEMAGNE (2496) - The deployment of a company of SPARTAN-I operatives against Insurrectionists over Eridanus II.
- Operation: COALPEPPER - A Spartan-IV operation in 2555 to recover the Huragok Quick to Adjust from United Rebel Front-controlled Talitsa.
- Operation: FIRST STRIKE (2552) - A small SPARTAN-II offensive against the Covenant battle station Unyielding Hierophant.
- Operation: HEMORRHAGE (Prior to August 2552) - Operation involving Kelly-087.
- Operation: HORN AND HIDE (Prior to August 2552) - Successful assassination of a San'Shyuum missionary on Odenli'sh by Linda-058.
- Operation: HYPODERMIC (dates unknown) - A mysterious and secret ONI project that has been in progress since 2531.
- Operation: JOINT MONITOR (After November 2552) - Biohazard containment operation following the Battle of Voi in which Alpha-Nine participated.
- Operation: KALEIDOSCOPE (2502) - The assassination of rebel political leader, Jerald Mulkey Ander, on Harvest.
- Operation: KINETIC STORM (During or after 2553) - A series of reconnaissance and strike operations in an unknown Joint Occupation Zone in which Edward Buck participated.
- Operation: LEFT JAB (2552) - UNSC Naval operation in support of Operation: UPPER CUT during the fall of Reach.
- Operation: PHALANX - An operation on Circinius IV.
- Operation: PROMETHEUS (2537) - The attack on the Covenant shipyard K7-49 by SPARTAN-III Alpha Company.
- Operation: RED FLAG (2552) - A planned operation to capture a Prophet.
- Operation: SWORD 52 (August 2552) - Support of evacuation operations during the Siege of New Alexandria in which Alpha-Nine participated.
- Operation: TORPEDO (2545) - The attack on Covenant refinery planet Pegasi Delta by SPARTAN-III Beta Company.
- Operation: UPPER CUT (2552) - The UNSC deployment of the Sabre fighters against the Covenant onslaught during the Fall of Reach.
- Operation: VERITAS (2496) - ORION Project operation which uncovered Secessionist Union undercover agents occupying high offices within the Colonial Military Authority.
- Operation: WARM BLANKET (2544) - Classified ONI operation to retrieve the captured Dr. Catherine Halsey from a Covenant fleet following the Battle of Miridem.
- Operation: WHISPER AMONG STARS - An operation in which Captain James Cutter was involved at one point.
List of appearances
- Halo: The Fall of Reach (First appearance)
- Halo: First Strike
- Halo Graphic Novel
- Halo: Ghosts of Onyx
- Halo: Contact Harvest
- Halo Wars
- Halo Wars: Genesis
- Halo 3
- Halo: Helljumper
- Halo Legends
- Halo: Blood Line
- Halo: Reach
- Halo 4