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 U.S. Air Force provides air support for surface forces and aids in the recovery of troops in the field. As of 2015, the service operates more than 5,137 military aircraft, 406 ICBMs and 63 military satellites. It has a $161 billion budget with 313,242 active duty personnel, 141,197 civilian employees, 69,200 Air Force Reserve personnel, and 105,500 Air National Guard personnel.