CO EAS. Many STAP Marines reenlist prior to requiring any of these interviews. Only the last EAS interview is conducted by the commanding officer for STAP Marines. Units requiring a Career Retention Specialist Any battalion sized unit or larger requires a Marine holding the Occupational Specialty of Career Retention Specialist, that is to say, holding the MOS of 4821. Individual company Career Planners may be assigned at the command's discretion, but do not have to be formally trained, and do not receive SDA Type II pay, or the medium dress blue allowance and they are mainly there to support the battalion Career Retention Specialist. A squadron is the air wing's equivalent to the battalion. Typically a Sergeant or Staff Sergeant is assigned as the CRS for a battalion or squadron. It is important to note that a battalion usually is much larger than a squadron. A regiment or the air wing's equivalent of Aircraft Group requires a Career Retention Specialist, also. This Marine is in a leadership position among other Career Planners and typically has a vast amount of Career Planning experience. These Marines typically range from a Staff Sergeant up to a Master Sergeant. The division or the wing is the next rung in the Career Planning ladder and the Career Retention Program is usually run by a Master Sergeant at this level. After the division or wing, there are major commands such as Marine Forces Pacific, whose Career Retention Specialist is a Master Gunnery Sergeant. Many Career Retention Specialists are required at Headquarters, U.S. Marine Corps in Quantico, VA who process incoming requests on the Total Force Retention System. There are a variety of units in the Marine Corps, but the explanation above covers most units' organization. References United States Marine Corps personnel