Operation: TANGLEWOOD[1] was a classified UNSC Marine Corps mission, presumably headed by Project ORION, against the Insurrectionists. It was a classified operation, seeing as no information was accessible for reference in the military (though not many military operations are normally).

The young Private Avery J. Johnson was involved in Operation: TANGLEWOOD as an ODST.


  1. Halo: Contact Harvest, page 47

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