What Is 3521 in the Marines?


A 3521 in the Marine Corps refers to a Marine's job or career designation. It's a military occupational specialty of auto mechanic. The first two numbers describe the motor transport field. The last two denote the particular job that the Marine does -- in this case, automotive organizational mechanic. Also, it designates that she's an enlisted Marine. Marines who earn the 3521 MOS hold ranks ranging from private to sergeant.

Significance of the Job

  • The Marine Corps depends on a variety of vehicles to move around, and every vehicle needs to be maintained. Such maintenance is the responsibility of Marines serving in the motor transport specialty field. There's also a need for many men and women trained to operate and repair Marine Corps motorized vehicles. Without them, the Marine Corps might be unable to deploy as quickly as needed.

Career Paths

  • Within the 35XX MOS field are 12 different enlisted Marine career paths. Marines holding the 3521 MOS who advance from sergeant to staff sergeant become motor transport chiefs. This means moving from primarily hands-on work to supervisory duties. They must also attend advanced training in keeping with new responsibilities. They also earn a new MOS of 3529. Every Marine wishing to be a motor transport chief must eventually attend the course.

Testing and Training

  • Marine enlistees hoping to work in the motor transport field must meet certain minimum entrance test scores. They also must successfully make it through Marine basic training. After that, they attend the automotive organizational maintenance training course. The course is given by the Marine Corps Motor Transport Instructional Company, which is located at Camp Johnson, a satellite facility of Camp Lejeune in Jacksonville, North Carolina.

Training Details

  • The required training course normally encompasses 59 training days, or 12 weeks. This doesn't include weekends or any holidays occurring during that time frame. Trainees learn basic vehicle familiarization along with required maintenance protocols. Additionally, vehicle servicing and preventive maintenance issues are also introduced. The program also usually includes three days of physical fitness training per week. Additionally, students will stand watch or guard duty on occasion.

Expert Insight

  • Marines who hold the 3521 MOS are usually part of a Marine combat service support organization. Most start their careers in a motor transport company or other small unit. These kinds of companies exist solely to support the combat mission of the Marine Corps. Motor transport units include general mechanics and those trained to service specific equipment, such as light and heavy duty diesel trucks and Humvee four-wheel-drive vehicles.

Related Searches


  • Photo Credit ChrisSuperseal/iStock/Getty Images
Promoted By Zergnet



You May Also Like

  • Marine Corps MOS Job Description

    A U.S. Marine's occupational field specialty is reflected by the military occupational specialty (MOS) she holds. It's a four-digit code, with the...

  • How to Repair the Pull Cord on a Toro Snowblower

    Toro snowblowers have gas engines. To engage the engine and start the snowblower, you pull on a pull cord. The cord can...

  • How to Run a Mechanic Shop

    A mechanic shop can be run in different ways depending on the ownership. It is easier to run a sole proprietor mechanic...

  • The Disposal of a Marine Corps Uniform

    The United States Military has very strict rules and regulations regarding conduct within military ranks. One of the first things a Marine...

  • The Duties of an E5 USMC Sergeant

    The duties of a sergeant (E-5) in the United States Marine Corps vary as much as the jobs to which they can...

  • 1974 GM Big Block Specs

    General Motors developed a line of large V-8 engines referred to as "big blocks" because they replaced a series of relatively smaller...

  • Easy Removal of Freeze Plugs

    Automotive freeze plugs are round metal plugs installed in the casting holes in engine blocks. These plugs are thin and sometimes rust...

Related Searches

Check It Out

3 Day-to-Night Outfits for the Work Week

Is DIY in your DNA? Become part of our maker community.
Submit Your Work!