US Military branch codes in records, how do they work?

Doing a personal history project on the US Military. Came across something about 'branch codes' in US military records. What do they mean and how do they work?

Great question! US Military branch codes are often found in official military personnel records. They primarily designate the military branch (like Army, Navy, Air Force, Marines, Coast Guard, or Space Force) and the specific job or role the person held in that service.

For instance, in the U.S. Army, an "11B" code signifies an Infantryman, while "79R" indicates a Recruiter. Similarly, in the U.S. Navy, a code such as "HM" refers to Hospital Corpsman, while "MT" stands for Missile Technician.

Each component of the code can reveal something about the servicemember's military career. The first part usually designates the occupational field. This can be followed by the specific job within that broader field.

However, these codes and what they represent may vary among different branches and can change over time as the military evolves and creates new roles or modifies existing ones. For example, a code that existed in World War II might not be in use today or might refer to a different position now.

Understanding and interpreting these codes can be complex, especially without a direct reference from the branch itself. Therefore, it might be necessary to consult a reference guide or contact the National Archives for specific assistance in interpreting these codes for your research. It's also worth noting that a veteran's military branch code provides a narrow view of their service; they might have had multiple roles throughout their career that aren't reflected in a single code.