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A company is a military unit used to organize UNSC Marine Corps and UNSC Army combat units.[1][2]


A company contains four platoons plus a group of personnel assigned as "Company Headquarters Section", which totals to 164 personnel. A company is commanded by a first lieutenant or a captain, with a company sergeant—typically a staff sergeant or a gunnery sergeant. The twelve companies of a brigade or regiment are identified phonetically "A" (Alpha) through "M" (Mike) with the exclusion of "J" (Juliet). The first battalion consists of companies A through D, while the second battalion is composed of companies E through H, and so forth.[2]

Generally, an infantry company would be composed of three infantry platoons and one heavy weapons platoon. Though, these numbers are flexible depending on the unit type and mission. "T" companies, for example, eschew this model and mix their heavy weapons personnel into each platoon so all the platoons have one heavy weapon squad.[2]

The SPARTAN-III program divided the Spartans into Alpha,[1] Beta,[3] and Gamma Companies,[4] with a Delta Company planned but not trained,[5] composed of approximately 300 Spartans per unit.

ODST companies consist of at most 220 Helljumpers per company. One company was Boomerang Company.

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  1. ^ a b Halo: Ghosts of Onyx, page 81
  2. ^ a b c Halo Encyclopedia, pages 54-55 (2011 edition)
  3. ^ Halo: Ghosts of Onyx, page 88
  4. ^ Halo: Ghosts of Onyx, page 98
  5. ^ Halo Encyclopedia, page 85