A squad is a military unit used by the UNSC Marine Corps in the organization of its combat personnel. In the UNSC Marine Corps, a squad can consist of anywhere between eight to thirteen members, and can be further divided into Fireteams for combat operations.
The UNSC Marine Corps does follow the general structure used by the 20th and 21st Century US Marine Corps, although exact numbers differ. Normally, a squad is composed of three Fireteams of four or five Marines under the command of a non-commissioned officer, usually a Corporal. A Sergeant commands the squad as a whole.