Infantry weapons officer

They mentor the officers and Marines of the unit in all applicable mechanical, doctrinal and conceptual weaponeering and training matters as required in order to improve the general effectiveness and proficiency of the command.

Additional duties will include: Battalion Landing Team (BLT) in support of a MEU, Team New Equipment Training (NET), new weapons systems and gear research and development, foreign weapons training, participation in applicable Course Curriculum Review Boards (CCRB), new curriculum development for marksmanship and infantry related tasks, vetting of draft Infantry, LAR, and Recon Training and Readiness Manuals and Fire Support Planning.

The Gunner's strength is the ability to vet, conduct and quantify combined-arms training and to introduce and sustain basic marksmanship tenets and principles across the Marine Corps.

During combat, a Marine Gunner may be tasked to inspect fire plans to ensure organic fires are integrated and mutually supporting at the battalion and regimental levels, act as the commanders "directed telescope" at critical events, command task organized or provisional combat units and/or design, construct and execute expeditionary training venues for Marine, Joint, NATO and Host Nation personnel.

Follow-on billets assignments may include: Active/Reserve Infantry Division, MAGTF-TC, Marksmanship Program Management Section (MPMS), Training and Education Command (TECOM), and Plans, Policies & Operations Headquarters Marine Corps.

These usually were the result of gunners being promoted to temporary commissioned officer status or changes in the laws governing the rank structure of the military.