A Battalion is a military unit of the UNSC Army[1] and Marine Corps, normally consisting of two to six companies, anywhere from three hundred to one thousand soldiers.


Tank and mechanized infantry battalion task forces apply their combat power to:

  • Conduct sustained combat operations in all environments with proper augmentation and support.
  • Conduct offensive operations.
  • Conduct defensive operations.
  • Accomplish rapid movement and limited penetrations.
  • Exploit success and pursue a defeated enemy as part of a larger formation.
  • Conduct security operations (advance, flank, or rear guard) for a larger force.
  • Conduct stability operations and support operations as part of a larger force.
  • Conduct operations with light infantry forces.

A battalion unit is generally considered the smallest unit able to conduct independent operations.


The typical Battlion is composed of four Companies, plus a "Battalion Headquarters Section," for a total of 800 soldiers. Each Battalion is commanded by a Major or Lieutenant Colonel, with a Gunnery Sergeant or higher serving as "battalion first sergeant."[2]

Within a Regiment, the First Battalion is generally assigned Companies A through D, the Second Battalion is assigned E through H, et cetera.[2]

Known BattalionsEdit


  1. 1.0 1.1 Halo: Contact Harvest
  2. 2.0 2.1 Halo Encyclopedia, Unified Ground Command, p. 55
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