Army Enlistment Options for MOS 11X

11X Infantry Enlistment Option

••• Official Army Photo

When you think about the Army, you probably envision a group of soldiers, carrying a variety of weapons, on patrol in rugged terrain,  looking for enemy fighters.  That is the Army Infantry and is considered the backbone of the Army.  Going infantry out of boot camp is a challenge, but it is also the gateway into more advanced fighting career fields such as Airborne Units, Ranger Battalions, Special Forces, Pathfinder, and Sniper School.

The Infantry motto is “Always Ready To Defend”.

From Basic Training, Through OSUT, and Beyond

After Basic Training, enlistees will attend Basic Combat Training and Advanced Individual Training as itr is combined into one school called One Station Unit Training (OSUT). This training is held in Fort Benning, Ga – Home of the United States Army Infantry.   This school lasts for 14 weeks, and primarily takes place in the field, as well as the classroom.

Infantry Soldiers are trained in and use small arms, anti-armor or indirect fire weapons (mortars) during combat missions. 

During training, they will list their specific infantry job preferences:

  • Infantryman (11B)
  • Indirect Fire Infantryman (11C)

The Army recommends Infantry Soldiers to possess tremendous discipline and high morale.  Be ready to accept a challenge and face danger. Have an interest in light weapons and ground tactics. And have the ability to remain calm under stressful situations.

Career Management Field 11 — INFANTRY

There are two main Infantry MOS's in the Army that a recruit can enlist into and be designated as either an 11B Infantryman or a 11C Mortar Infantryman after initial Army training.

There is no longer an 11H MOS or the 11M MOS. 11H (Heavy Anti-Armor Weapons Infantryman) and 11M (Mechanized Infantryman) have been converted into the 11B (Infantryman). 

When you are ready to visit the local Army recruiter and you know you want to become an Infantryman, you will be given the 11X enlistment option. 11X isn't an MOS (Military Occupation Speciality). The Army does not offer a "guaranteed job" for any specific Infantry MOS. Instead, one must enlist as an "11X." The "X" means that the specific job is not known at the time of enlistment. You must earn a slot to the Infantry during your schools and training.   

Individuals who enlist under the 11X Infantry option attend Infantry OSUT (One Station Unit Training), which combines Army Basic Training and Infantry AIT (Advanced Individual Training), all in one 14-week course. During that training, recruits are allowed to list their specific infantry job preferences, but ultimate assignments are determined by the "needs of the Army." Upon graduation from OSUT, recruits are assigned to one of the following Infantry MOS's:

The infantry is the main land combat force and backbone of the Army. It's equally important in peacetime and in combat. The Infantryman's role is to be ready to defend our country in peacetime and to capture, destroy and repel enemy ground forces during combat.

11B — Infantryman (Rifleman)

Specifically, the 11B Infantryman are riflemen and assist in the performance of reconnaissance operations. Employs, fires, and recovers anti-personnel and anti-tank mines. Locates and neutralizes mines. Operates, mounts/dismounts, zeros, and engages targets using night vision sight. Operates and maintains communications equipment and operates in a radio net. Operates in a NBC contaminated area. Constructs field expedient firing aids for infantry weapons. Typically more soldiers will be 11B as the need for them is greater.

11C — Indirect Fire Infantryman (Mortarman) 

Specifically, the 11C are Infantrymen but carry the mortar weapon systems and operate the pieces. They are riflemen as well but operator in smaller platoons so likely will not be part of kicking down doors. However, if the 11C is assigned to a light Infantry unit there is more opportunity to be used as a rifleman as well as the Indirect Fire Infantryman. Typically those who have the higher the ASVAB scores will most likely become 11C since their job involves more math. 

If a picture is worth 1000 words, a motivational 11B/11C video by the Army will help bring light to the differences of both Infantry MOSs.