Which rank in the enlisted army is indicated by three stripes up and three stripes down?

The rank indicated by three stripes up and three stripes down is the Master Sergeant. In the U.S. Army enlisted rank structure, the Master Sergeant holds a significant leadership position and is recognized for their experience and expertise. This rank typically involves considerable technical skill and responsibilities in training, leadership, and execution of tasks within their unit.

The three stripes up signify that the individual has advanced through prior ranks, while the three stripes down indicate a higher level of leadership responsibility, distinguishing it from some other ranks. Master Sergeants serve as crucial links between the enlisted personnel and higher leadership, often involved in mentoring junior soldiers and managing training operations.