Company

A Company is a military unit used to organize UNSC Marine combat units.

Composition
Assuming (on good authority) that the UNSC uses the same system used by the US military of the 20th and 21st Centuries, then a UNSC Marine Company would be composed of three rifle platoons, a weapons platoon, as well as a commanding officer, (normally Captain, but if incapacitated a Lieutenant ), an executive officer (normally First Lieutenant), a First Sergeant, Gunnery Sergeant, four Navy medical Corpsmen and non-combat staff.

Known Companies

 * The Spartan-III Program divided the Spartans into Alpha, Beta and Gamma Companies, with a Delta Company planned but not trained, composed of approximately 300 Spartans per unit.
 * Alpha Company
 * Charlie Company
 * Charlie Company (Halo 3)
 * Romeo Company
 * Tango Company