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.
The Army is considered to be the ground force of the military. Even though there are aviation units within the Army, their main missions are on the ground and the majority of the soldiers who serve have a job related to ground forces. The Army is also the largest branch of the military.