HMHT 302 (USMC) HMHT 302 refers to a specific military training course within the United States Marine Corps (USMC). The acronym stands for "Heavy Machine Gunnery Training" and is designed to train Marines in the operation, maintenance, and employment of various heavy machine guns. These weapons systems may include, but are not limited to, the M2 Browning .50 caliber heavy machine gun and the Mk 19 grenade launcher. The course aims to equip Marines with essential skills necessary for providing accurate and sustained fire support in a variety of combat situations. This training contributes significantly to the readiness and effectiveness of the USMC in achieving their mission objectives.