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 mission of the U.S. Air Force is to fly, fight and win ... in air, space and cyberspace.. To this end, it recruits those with a minimum high school diploma to receive training and work in such fields as aircraft, administration, computers and electronics. Information is from the U.S. Air Force as of February 2011.