A Master Sergeant is a senior non-commissioned officer rank in the United States Army and United States Air Force. This rank typically indicates a high level of experience and leadership within the military. Master Sergeants are responsible for training and mentoring junior enlisted personnel, as well as managing various operational tasks within their units. In the Army, the rank of Master Sergeant is denoted by three chevrons and three rockers, while in the Air Force, it is represented by a similar insignia. Achieving this rank requires a combination of time in service, demonstrated leadership abilities, and successful completion of required training courses.