A squad is the second-smallest military unit of organization, consisting of a squad leader and around a dozen soldiers under his command (depending on the country). A squad may further be subdivided into fireteams (the smallest military unit) of about four soldiers each.
Insurgency features two squads/cells per faction. Factions each have one assault element squad and one recon element squad. Each squad has a leader role, as designated by "[LEADER]" following a class' name in the squad selection screen.