How many fire teams are in a squad?

A Marine Corps squad is primarily composed of three fire teams. Each fire team is typically made up of four Marines, allowing for efficient operational flexibility as well as the ability to maneuver in different environments. This structure is designed to maximize firepower and maintain effective communication within the squad.

Having three fire teams allows a squad to effectively engage the enemy while also maintaining support and logistics, which are essential for success in infantry operations. Fire teams work together under the squad leader’s guidance, employing tactics to take advantage of cover and concealment, maneuvering to flanking positions, and employing suppressive fire in coordinated efforts.

The options suggesting two, four, or five fire teams do not align with the standard Marine Corps organization. Thus, three is the established standard for a squad's composition as it pertains to infantry tactics.