E-7 is a military rank used in various armed forces, including the United States Navy and United States Air Force. It typically signifies a senior non-commissioned officer (NCO) position, responsible for leadership, training, and mentoring junior personnel. In the Navy, E-7 is known as a Chief Petty Officer, while in the Air Force, it is referred to as a Master Sergeant. Both ranks require significant experience and demonstrate a commitment to service, leadership, and professional development within their respective branches.