0311

0311 is a numeric designation used in several contexts. In the United States Marine Corps, 0311 designates the Military Occupational Specialty of Rifleman, the primary infantryman MOS.

Role and duties: Riflemen provide close-combat capability, conduct reconnaissance, security operations, patrols, and support to higher infantry units. They are trained in small arms, navigation, first aid, and fieldcraft.

Training and career: Marines assigned 0311 complete recruit training and then infantry-focused schooling at the School of Infantry. After initial training, they may progress to leadership positions and additional infantry courses.

Insignia: The infantry MOS is associated with the infantry rifleman insignia, featuring crossed rifles. Marines assigned 0311 may wear appropriate insignia on their uniforms to reflect their specialty.

History: The 0311 designation has been part of the Marine Corps' MOS system since the early 20th century as the standard designation for rifleman; the 03xxx block covers ground combat specialties within the Marine Corps' occupational structure.

Other uses: Outside the Marine Corps, 0311 may appear in product codes, catalog numbers, or as a date (03/11). Without context, it is ambiguous.