The US Army and US Marine Corps infantrymen pride themselves on being some of the biggest badasses on every block they roll into. They have more similarities than differences, but they’re unique forces. Here are 5 ways you can tell Marine and Army infantry apart:
Note: For this comparison we are predominantly pulling from the Army’s Infantry and Rifle Platoon and Squad field manual and the Marine Corps’ Introduction to Rifle Platoon Operations and Marine Rifle Squad. Not every unit in each branch works as described in doctrine. Every infantry unit will have its own idiosyncrasies and units commonly change small details to deal with battlefield realities.
1. Platoon organization
Army and Marine Corps rifle platoons share many elements. They are both organized into larger companies, both contain subordinate squads organized into fire teams, and both employ the rifleman as their primary asset. The Army platoon has a radiotelephone operator and a medic. The Marine platoon has a radio transmitter operator and a corpsman who fulfill the same functions.
The Marine Corps rifle platoon contains three rifle squads. Each squad is led by a sergeant who has three fire teams working for him, each led by a corporal. The fire team leader typically carries the M203 grenade launcher slung under his M16. Operating under him are the automatic rifleman, assistant automatic rifleman, and rifleman.
The Army platoons contain smaller squads. An Army rifle squad leader is typically a sergeant or staff sergeant who leads two four-man fire teams. Each Army fire team consists of a team leader, an automatic rifleman, a grenadier, and a rifleman. Note that the Army squad is using a dedicated grenadier in place of an assistant automatic rifleman. Typically, one rifleman in each squad will be a squad designated marksman, a specially trained shooter who engages targets at long range. Also, the Army has an additional squad in each platoon, the infantry weapons squad. This squad has teams dedicated to the M240B machine gun and the Javelin missile system.
Both Marine Corps and Army infantry platoons operate under company and battalion commanders who may add capabilities such as rockets or mortars when needed.
2. Weapons
The Army typically gets new weapons before the Marine Corps. It moved to the M4 before the Marine Corps did, and soldiers are more likely than Marines to have the newest weapons add-ons like optical sights, lasers, and hand grips. Marines will get all the fancy add-ons. They just typically get them a few years later.
The Army is quickly adopting the M320 as its primary grenade launcher while the Marine Corps is using the M203. The M320 can be fired as a stand-alone weapon. Either the M320 or M203 can be mounted under an M16 or M4.
3. Fires support
Obviously, infantry units aren’t on their own on the battlefield. Marine and Army rifle units call for assistance from other assets when they get bogged down in a fight. Both the Marine Corps and the Army companies can get mortar, heavy machine gun, and missile/rocket support from their battalion when it isn’t available in the company. For stronger assets such as artillery and close air support, the services differ.
Marines in an Marine Expeditionary Unit, an air-ground task force of about 2,200 Marines, will typically have artillery, air, and naval assets within the MEU. Soldiers in a brigade combat team would typically have artillery support ready to go but would need to call outside the BCT for air or naval support. Air support would come from an Army combat aviation brigade or the Navy or Air Force. Receiving naval fire support is rare for the Army.
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