Proper posture starts with a good understanding of the muscles that are involved in posture. Several different muscles are responsible for maintaining upright posture, and over time, poor posture can cause these muscles to lose strength.
Air Force. A major in the Air Force typically has duties as a senior staff officer at the squadron and wing level. In flying squadrons majors are generally flight commanders or assistant directors of operations. In the mission support and maintenance groups majors may occasionally be squadron commanders.
(v) Other responsibilities of the Air Force include: (A) With respect to amphibious operations, the Air Force will develop, in coordination with the other Services, tactics, techniques, and equipment of interest to the Air Force and not provided for by the Navy and Marine Corps.