Marine Corps Warfighting Publication (MCWP) 3-15.1, Machine Guns and Machine Gun Gunnery, describes how various machine guns are maintained and employed by the U.S. Marine Corps' machine gun crews. It also provides the principles and techniques for their use in engaging and destroying enemy targets.

This reference publication is designed for machine gunners, platoon commanders, platoon sergeants, S-3 officers and chiefs, armorers, and ammunition technicians. It outlines a standardized way to train Marine machine gunners through the use of gunnery tables.